Top public and private dog agility parks in Southwest Portland, Oregon

Helvetia Hound Playground

2 Acre fully fenced Private Dog Park in the country hills of rural Hillsboro. Bring your pups to enjoy a fun time in this grassy park equipped with parkour obstacles, a covered seating area, propane grill and more!

Private Dog Park by the Creek

Private Dog Park on 1+ Acres Near Mt. Scott Creek IMPORTANT: Fresh tap water is not available in the dog field across the creek, and water bowls are not provided. If you prefer that your dog not drink from the creek, please bring your own drinking water and bowl. Just five minutes from Clackamas Town Center, our one-acre field offers plenty of open space, rolling hills, and access to peaceful Mt. Scott Creek. The creek flows year-round, although the water level drops during summer, and several areas allow dogs to wade and cool off on warm days. Please be aware that the creek is not fenced at either end, so this spot may not be suitable for dogs likely to follow the creek beyond the property. We do not use conventional chemical pesticides. The field is treated with organic diatomaceous earth in early spring and late fall to help control pests. The creekside can become muddy during winter, but most of the property—especially the upper fields—remains dry throughout the year. Please bring: • Drinking water for your dog • Your own water bowl • A towel during wet or muddy weather Because the property is large, dog waste can easily be missed. Please keep track of where your dog goes and pick up all waste after. Complimentary waste bags are provided, with one trash bin near the creek and another in the upper field. Sniffin’ Hours: Monday to Sunday Spring & Summer: 8 AM – 9:00 PM Autumn & Winter: 8 AM – 7 PM Thanks for Sniffin’ at our Spot! —Daniel & Family

Tail Waggers private dog park

Your attendance has allowed us to continue development of our Disney Land for dogs and being a contributor to the Portland Humane Society. Toward that end this is what we have to offer at present with more to come. Two main walking trails, with two offshoot trail loops at present. Signage is there at each to help you in and out of each. Each has a selection of walking sticks at the trailhead, should you choose to use them. Appropriate good grip footwear is recommended especially during our monsoon season. Trail one, the shorter of the two, is about 25 minutes give or take, and takes a degree of dexterity more than trail too. Trail two contains two loops trails that take 30 to 45 minutes there and back to the parking area. The trail has two rest areas to sit with umbrellas to keep the rain off when needed. Trail 2, loop two has large Vern plant areas like you may have seen in the Jurassic Park movies.  There are (2) Two parking areas, one much larger for up to 25 cars to accommodate larger group events. The 2nd is at the top of the hill b4 you go down into valley were you will see a sign letting you know that if your early you can park there till your designated reservation time. At the bottom you will find a porta potty for your convenience with a lighted pathway after the sun has set. For your convenience you will find seven Poop Depots with bag dispensers throughout the park. A guest ( Mark) donated a fire hydrant as a much appreciated pee station for many pups. There are two water play areas. The preferable one is now down by our inlet water pipes. Its a shallow pool area feed by spring water, so there is no concern about algae. We call it the pup self wash area because it’s only belly deep and is an absolute favorite of the pups to play in. It’s also proved to help pups who might be afraid or timid of playing in water to investigate it a little more. The other is the larger man-made pond area. This at one time was a large beautiful pond, that we had invested a large amount of money to development a Doggie Dock Dive. We had also a selection of small watercraft to help acclimate pups to being on the water with a parent. It included a selection of different size lifejackets for parents and pups. Floatable toys for retrieval were nearby. All that however became unusable because our neighbor who controls the water level with a dam did not like us having a private dog park and said if we didn’t shut it down he would just empty the pond, which he ultimately did and mow as a result has become a mud flat. We have a solution that will bring the level back up and have set up a Go Fund Me to help us with that expense. Any donation would receive a gift certificate to show our appreciation. They can use it for their own use or it can be given to a non Sniff Spot member to use at our park for various functions. Our Muddy Paw Spa has multiple cleaning brushes, paw wash cups, a spray hose and the more favorite is a water spray wash glove that sprays water out of the palm of the glove. This is an important option especially during our monsoon season to clean pups and shoes before getting into the car. Included, are multiple towels to dry off your pup, and a close line to hang the wet towels on to dry off. In the area where you see all the picnic tables, you will see a Doggie Dig Box filled with beach sand for those pups who have the need to just dig. Near to that is an upright 50 Pd “Tug of War” that big pups love. Next is a childrens play area to play in and on. We installed a tetherball for the children, but soon learned that the pups love playing with it, who would have guessed? Down from the children’s play area is a comprehensive agility course with all the obstacles that you would see on the YouTube obstacle course events. Love seeing the pups racing around that. Multiple toy stations. If on your visit, you would like to donate unused toys for other pups to enjoy that would certainly be appreciated. A long mowed area above the pond for long distance ball and frisbee retrieval. They’re also a few frisbee catchers there to practice frisbee throwing accuracy. Long, medium range and putter frisbees are provided. A 10 x 10 doggy dig sandbox for those pups to enjoy digging. A tug-of-war for those pups will enjoy a good tug. The picnic area has been expanded to accommodate pup, birthday parties, pup, groups, and family gatherings. For those bringing young children, a swingset. Solar lighting around trees, parking area and the porta potty will help to illuminate these areas when darkness falls. There are water dispensers with water bowls. There is another area being developed presently that will become an urban agility course.

Columbia Gateway Private Dog Park In Vancouver

Welcome to Columbia Gateway! *Please avoid the west-end under construction, for the safety of yourself and our ADU project.* Our park is a fairly wide-open space where your dogs can run and play. We have a variety of shady spots, trees, plants that harbor animals and birds. Pick your fill of blackberries July-August. Please never bring any unvaccinated dog or puppy. Please monitor your dogs and clean up any messes. Extra waste bags are available in the old metal milk box located on the ground, left of the porch steps. Credits are given to good samaritans for helping with missed piles! Please report any problems, hazards, concerns or issues as soon as possible! We want to get things handled asap! Absolutely no digging; Please do not allow your dog to dig. Private areas: -house including the porch - Water is provided unless freezing temps are expected May-Sept PLEASE USE SPIGOT next to House Chimney for water. If not working properly, blue yard hydrant handle should always be open (up) in summer months. Dedicated Park area is EAST of the driveway and the grassy area that wraps around back of the house. Have a good time exploring and playing! We appreciate your business and love dogs. Please just encourage them to avoid the porch areas and flower/fruit gardens. Leave any open water line or hose running if found that way in summer months. Residents of the home may come and go during your reservation. This is a rare but possible occurrence. We are mindful of your space, and we are careful to ensure the gate is kept closed. Thank you for visiting our Sniffspot! Happy sniffing :-)

NEFFENDORF FARM(F2)OpenLate,GAZEBO,pool,RESTROOM,picnic tables

Proud to be chosen as Sniffspot's global business model again in the February 27, 2024 online Newsweek magazine, the June 5, 2023 of Womens World magazine. Also featured in Business Insider on June 9, 2022. YOU'RE WELCOME TO DRIVE UP TO 3 RIGS INTO THE PARK, MUD FREE (stopping at end of asphalt), then closing the big farm gate behind you so that you can release your 10# and over pup(s) without leashes. or worry of them getting into the road! VERY IMPORTANT: EACH PARK (F1 AND F2) HAS A SEPARATE ENTRANCE AND DRIVEWAY WITH THE SAME ADDRESS. SO, YOU MUST READ THE SPECIFIC DRIVING DIRECTIONS INTO EACH PARK. PLEASE TELL YOUR FRIENDS TOO IF THEY'RE MEETING YOU HERE. THANK YOU!! Upon entering, you won’t be able to see the people or dogs in field one (F1) while you are in F2. Maybe just a glimpse of them when they are arriving or leaving their cars from a distance. We have buildings and trees that separate the two. We offer poop bags all around the field, and a garbage can for your use (used poop bags only please). If you happen to see a pile someone missed, please help us out, but PLEASE BE AWARE OF YOUR PETS AND PICK UP AFTER THEM, TOYS TOO!!!. Thank you so much for your cooperation! We also provide a large fence attached bowl and water hose, balls/chukits and fun toys, comfy swing, gazebo rain shelter, and plenty of tables/benches. Bring your friends and their dogs and make a party out of it! If you'd like to have an event on our farm anywhere, we can discuss your wants and make something work for you. We also host overnight stays in two cottages we have on the property. BUT, you CANNOT bring your pets here to stay the night. We want to keep the cottages pristine and dander free for our Airbnb glamping guests that book here. Thanks for reading! Hope to see you here soon! We know you will love our magical farm! You can easily find our SS links and cottage rentals at: www.neffendorffarm.com

Mountain View Farm and Firewood 15 Acre Unfenced Private forest In Banks

Parking is at the top of the trail. There is roughly 150 FEET elevation change from the top of the trail to the bottom of the trail. It is a hike. Seating, trash cans, and watering bowls are available along the trail. Grass field area for playing fetch and areas to dig come first along the trail. Then the trail goes into the forest. Seating and dog water available on the trail. Wildlife walk the trails too. Use caution We have sheep, turkeys and chickens on the farm. Stay clear of pasture fencing. Hot wire used inside of the pasture, don’t touch. Water stations may change due to weather conditions. We offer fresh $5 egg and $10 firewood bundles that you can pay cash, Venmo here or on this app.

Elee's Acres Fully Fenced 2 acres. Open 6am to 10pm - dog splash pool, shady spots and misters.

Well off the road surrounded by trees and other fields. Plenty of parking. Drive-in parking in the spot. Perfect for multiple dog families. Designated Sniffspot separate from our yard. Covered gazebo. Perfect field for fetching balls or frisbees. Shady spots with seating, dog splash pool, and misters for summer heat. 12 miles North of the 205 bridge. Easy going hosts. Let us know if you have special requests or things you would like to see added to the spot. Videos and news on our Facebook page https://facebook.com/61562477135187. Elee’s Acres Sniff Spot *If you are fostering a dog, message me and I will send you a code for a free visit.

Savor Panoramic Views at the TOP of Scott Mtn

Whether you're looking to catch the sunset, or just relax above the clouds, our Yard is the place to be. We are located just a few minutes from HWY 205. PNW weather can be unpredictable so keep in mind when booking in advance and BUNDLE up!💨☔️😶‍🌫️ The fully fenced yard features views of the city, lounge chairs, dog toys, water hose, and some covered shade. Treats on occasion, Rocks, grass, ledge out back.🚨 *Parking space is available unless otherwise noted. 🔵 Please use Caution when entering and exiting the property. There are hills, slopes and even deer spotting.🦌 See additional Rules for doggy play dates upon booking. 🚖🐾 Later hours now available!🌅

The Paw'd Park In Battle Ground

Our spot was designed and built specifically to help keep pets in their homes. We are a search and rescue that deals with hard cases and know what its like to have dogs that can’t be around other dogs, animals or people. This spot is dedicated to those dogs in an effort to help keep them active and happy at home so their families don’t have to give them up or have them end up in a shelter. All proceeds from this sniffspot go directly to I Paw’d It Forward's mission of keep families together.

Woodland Dreams - Wooded Pasture Area - Trails - Creek Access In Estacada

Fenced wooded & pasture area with Private Entry. Optional access to trails and a year round creek. Lots of room for zoomies and sniffing around! Follow us on IG and tag us in your photos: woodlanddreams.sniffspot Pasture Area: Agility equipment, Covered Seating area, waterproof storage (toys, treats and poop bags), big trees that provide shade, natural obstcles (wooden balance beam and tree rounds). Porta Potty located in Sniffspot for our guests! Trail and Creek area: Optional access to trails and a year round creek. (Through gate - Less securely fenced area, leashes encouraged in this area) Bench & Trash provided in creek zone. The sniffspot can become muddy during rainy season, come prepared. Please bring: • Drinking water for your dog • A towel during wet or muddy weather

The Dog-Out at Big Sky Ranch, Fully Fenced Park For Dogs In Oregon City, includes Outhouse.

Relax with your pooch in a hidden valley away from street noise in our private dog park called The Dog-Out! Sit in the woodsy A-frame hut, out of the sun or rain while your pups explores the 1/3 acre area. Sit at the picnic table and share lunch together. Need to get out some energy? Run your dog through all the agility obstacles! A Saw-Dust Toilet Outhouse is available for your convenience. See pictures. It’s there incase you need it. Coming Soon: a swing-set for the kids, more obstacles, more toys. Dogs are free to dig as much as they want! Our farm is 1/2 mile down a private drive. The Sniffspot is at our property entrance along our driveway. There’s a mini-Aussie that lives in the white house 500 ft away from the Sniffspot. She might bark, that’s all. ☺️ There is a slight chance of seeing kids walking with their dog, but they know to avoid the Sniffspot. Hey! Follow us on Instagram @TheDog_Out And let the dogs play!

NEFFENDORF FARM (F1)WATER MISTER,restroom,NIGHTUSE,agility,SHADE,pool

AS YOU KNOW, WE TRY HARD TO KEEP THE PARKS UPDATED AND COMFORTABLE FOR EVERYONE, TWO AND FOUR FOOTED. THANKS FOR YOUR LOYALTY AND SUPPORT! WE APPRECIATE IT! OPEN SUNUP TO 10P NIGHTLY! VERY IMPORTANT!!! EACH PARK (F1 AND F2) HAS A SEPARATE ENTRANCE AND DRIVEWAY WITH THE SAME ADDRESS. SO, YOU MUST READ THE SPECIFIC DRIVING DIRECTIONS INTO EACH PARK. PLEASE TELL YOUR FRIENDS TOO IF THEY'RE MEETING YOU HERE. THANK YOU!!! upon entering into either park, you won't be able to see people or dogs in F2 while you are in F1. Proud to be Sniffspots most popular park(s) with the most reviews. Read about us in the February 27, 2024 issue of Newsweek magazine, June 5, 2023 issue of Womens World Magazine, and the Business Insider's June 9, 2022 articles. You and your pups will love our very artistic boho farm! Mud free paved entrance and patio, extra picnic table, chairs and tables, swing, toys, night lighting til 10pm, light up collars/leashes upon request, disc golf basket, clean porta potty access, doggie poop bags hanging all around the field w/disposal cans! There's alot more to the 7 1/2 acre farm that makes it very unique. it's sort of like a rural "Portlandia". We've hosted dozens of weddings, parties, concerts, and reunions here in the past. So, just ask if you'd also be interested in using the farm for your own special event! We've had tons of doggie play date and birthday parties here. Just inquire first letting me know how many cars there'd be. If too many cars for F1, then F2 will work out during dry months, as you can drive your cars right into the field. Hope to see you and your pups playing out here soon! We try very hard to remain the #1 spot between both parks, globally. Thank you for helping us achieve that by continuing to support us!! Combined we are now almost 6K reviews!

Fully Fenced Backyard in Roseway 🌹🐶

Come play! Enjoy our private fully fenced yard just behind our home. Lots of places to explore. Plenty of street parking. There is water, poop bags, hand sanitizer, trash can, treats & toys available. 🐕🐾🎾🦴🌲🪵

Whistlestop Private Dog Park

This is a working sheep farm. You may see rams in the adjacent pasture. The L shaped field is about 2.5 acres of open ground. A second field is now open, adding 3.5 acres of short grass. Feel free to park directly in front of the gate for ease of loading in and out. You may see me or my farm hand at work. If you need a no visual/no contact visit, please let me know in advance.

Harlen's Three Mountain View Dog Park

Welcome to Harlen's Three Mountain View Dog Park, where tails wag freely and furry friends frolic under the open sky. This haven for canine companionship offers a sanctuary of joy and excitement, set against the backdrop of breathtaking natural beauty (for humans too). Fully fenced for the safety and security of your beloved pets, Harlen's Three Mountain View boasts a sprawling expanse of lush greenery, spanning over an acre of play space. Surrounded by the majestic peaks of three towering mountains (Hood, Helens, and Jefferson), the park offers a picturesque setting that is sure to inspire both you and your four-legged companions. Whether your furry friend prefers chasing balls across the open field or exploring the grounds that meander through the park, there's something here for every pup to enjoy. As you watch your canine companion bound through the grass, their tail wagging with unbridled joy, you can't help but feel a sense of peace wash over you. In this idyllic oasis of happiness, the worries of the world melt away, replaced by the simple pleasures of companionship and play. So come join us at Harlen's Three Mountain View Dog Park, where every day is a new adventure and every bark is a symphony of happiness. Let your furry friend roam free in this haven of fun and friendship, and make memories that will last a lifetime.

Macondo The Farm 2 Acre Fully Fenced Private Dog Park In Beavercreek

Welcome to Macondo The Farm! It is a great place to spend quality time with your dogs and enjoy the beautiful countryside views. Please be aware that there may be seasonal puddles near the end of the property, so plan accordingly.

Ash Avenue Dog Park

The Ash Avenue Dog Park in Tigard, Oregon is a fully fenced enclosure that caters to small dogs. It features amenities such as chairs, dog drinking water, a dog washing area, and a field for dogs to play. The park is open from dawn to dusk and can be contacted at 503-718-2591 or via email at [email protected]. More information can be found on their website at https://www.tigard-or.gov/your-government/departments/public-works/parks-recreation/parks-finder/dog-parks.

Park hours: Dawn to dusk

Dog Park

The Dog Park at 5495 SW Erickson Ave in Beaverton, Oregon is an unfenced park with agility equipment for dogs to enjoy. The park also offers amenities such as dog drinking water and a table for owners to relax while their furry friends play.

Field of Dreams

I have an acre of dog safe fenced field. I do use this for my own dogs as well. It is maintained and a nice area for dogs to run!

Waluga Dog Park

Located at 15775 Waluga Dr in Lake Oswego, Oregon, Waluga Dog Park is an unfenced park that offers agility equipment for dogs, making it an ideal spot for playful pups. The park is small dog friendly and provides drinking water for dogs, as well as chairs and tables for owners to relax. Additionally, there is a trail for both dogs and owners to enjoy a leisurely walk.

Creekside Pup Park Mulino Oregon

Welcome to Creekside Pup Park Where Adventure, Play, and Training Come Together Give your dog the ultimate outdoor experience at Creekside Pup Park — a fully fenced private dog park designed for safe play, enrichment, and advanced training. Surrounded by beautiful farmland and a nearby creek, our park offers a relaxing getaway for both dogs and their humans. Whether your pup loves to sprint, explore, socialize, or train, Creekside Pup Park is the perfect place to enjoy quality time together in a beautiful natural setting. --- What We Offer 🐾 Safe, Spacious Private Play Area Our large, fully fenced park provides a secure environment where dogs can run, play, and explore freely. Enjoy peace of mind while your pup burns energy in a clean and well-maintained space. --- 🌿 Relaxing Atmosphere for Owners Sit back and unwind in our canopy-covered seating area while your dog plays. We also provide: Portable restrooms Convenient waste disposal stations Plenty of open space to relax and enjoy the scenery --- 🐕 Professional Agility Equipment Looking to challenge your dog mentally and physically? Our professional-grade agility equipment is perfect for: Beginner and advanced training Confidence building Competitive agility preparation Active enrichment and exercise Whether you’re practicing for competitions or simply having fun, our agility setup offers a rewarding experience for dogs of all skill levels. --- 🌲 Creek & Forest Exploration Area Feeling adventurous? Guests can also enjoy access to our unfenced creek and forest area for nature walks and exploration. Please note: Dogs must remain under full control at all times in unfenced areas Wildlife may be present Other dogs may occasionally be visible across the creek This area is ideal for well-trained dogs who enjoy exploring new sights and scents alongside their owners. --- Why Dogs (and Owners) Love Creekside Pup Park ✔ Fully fenced private park ✔ Peaceful countryside setting ✔ Creekside views and wooded trails ✔ Professional agility equipment ✔ Comfortable amenities for owners ✔ Perfect for playdates, training, and exercise --- Book Your Visit Today! Come experience the perfect mix of fun, freedom, and training at Creekside Pup Park. Whether you're looking for an exciting play session or focused agility work, we’re here to help your dog thrive. We can’t wait to welcome you and your pup! --- 👍 Follow Us on Facebook Stay updated with park news, photos, and events! 👉 https://www.facebook.com/profile.php?id=61564863070512

Dog Park at Brentwood Park

The Dog Park at Brentwood Park in Portland, Oregon is a fully fenced enclosure where dogs can socialize and play off-leash. Owners must adhere to the provided rules, ensuring their dogs are well-behaved and supervised at all times. The park offers amenities such as agility equipment, chairs, and dog drinking water. The park is open from 5:00am to midnight and visitors can find more information on their website or contact them via phone or email. Overall, this dog park provides a safe and enjoyable environment for dogs and their owners to have fun and exercise.

Park hours: 5:00am-midnight

Two Sisters Dog Park

2026-4-9 update - Sniffspot closed. Will be adjusting entry to provide privacy for our neighbors at the gate. Send me a DM for any questions. 2026-4-5 update - Happy Easter! Water is back on. 2026-1-12 update - we are in lambing season. Keep your eyes out for new mamas that might be a bit skittish. Also regarding fencing... still a work in progress... been a bit busy! 2025-1-18 Update: The second field is now fully fenced. I'm still working on a few areas. There are some high spots that are going to be filled in shortly. Welcome to Two Sisters Dog Park. We have a perfect little slice of freedom for your pupper! Our property is fully-fenced, so let your dog go ham! As a working hobby farm we are constantly working on the property, but we will always be respectful and give you privacy. If you or your dog wants to say hello or has any questions about the animals/property, we are here, just give a wave or a holler. Please make sure all dogs and people visiting are respectful of the farm animals. We have goats, sheep, chickens, and turkeys fenced in along the dog area. We have a roaming farm cat. We have bee hives on property but away from the dog area. We do have a Rough Collie puppy on site. He is indoors but is 99% interested in running around if your dog would like a companion.

Normandale Dog Park

Normandale Dog Park in Portland, Oregon is an unfenced park with agility equipment, small dog-friendly areas, dog drinking water, chairs, tables, and an indoor restroom. The park is open from 5 AM to 12 AM seven days a week. Contact information can be found on their website at portland.gov or by calling 503-823-4000 or emailing [email protected].

Park hours: 5 AM–12 AM 7 days per Week

Hazelia Dog Park

Hazelia Dog Park in Lake Oswego, Oregon is an unfenced dog park located at 17800 SW Stafford Rd. It offers amenities such as dog drinking water, chairs, a table, and an indoor restroom. The park is open from 6AM to 10PM every day of the week. For more information, visit their website at oswego.or.us or email [email protected].

Park hours: 6 AM–10 PM 7 days per Week

Rogue Ranch

Several trails, a shallow creek, and partially wooded. Main loop trail (Rogue Loop) is 0.56 miles in length. The rest of the trails add another 1/2 mile. Access to hose and bowl for fresh water and rinsing off muddy feet (not available when temperatures are below freezing). WiFi available (rogue ranch guest) at the front of property, and cell service throughout. Property can be muddy if it has been/is raining. Recommend boots for humans. Recommend strong recall for dogs visiting or long lead. Bring towels to clean/dry dog feet. Please pick up after your pet and dispense in one of the three waste containers along the trails. Please be respectful of privacy to the occupants in the house!

Tualatin Dog Park

The Tualatin Dog Park in Oregon is a fully-fenced enclosure where dog owners can let their pets off-leash in designated areas, following specific rules such as current dog licensure, waste removal, control of aggressive dogs, and more. The park offers amenities like agility equipment, chairs, and tables, and is open from sunrise to sunset. Visitors should be at least 12 years old unless accompanied by an adult, and no more than two dogs are allowed in the off-leash area at a time. The park's website is https://www.tualatinoregon.gov/recreation/tualatin-dog-park, and the phone number is 503.691.3061. Email inquiries can be sent to [email protected].

Park hours: Sunrise to sunset

INDOOR sand arena

Small family farm, located on a safe, quiet road. The well-maintained Indoor sand arena of our horse barn makes for the perfect all weather dog park! *farm animals are not in view while inside the arena. Scenic, peaceful location. Separate SniffSpot guest entrance to indoor arena. Arena is very large and secure; great for training! ***Excessive barkers may be asked to leave.

Winkelman Dog Park

Winkelman Dog Park in Beaverton, Oregon is a fully fenced park located at 10139 SW 175th Ave & SW Gloss Rd. The park offers amenities such as agility equipment, chairs, dog drinking water, and tables. It is small dog friendly and provides a safe and fun environment for dogs to socialize and play. For more information, visit their website at https://www.thprd.org/parks-and-trails/detail/winkelman-park or call 503-629-6360.

Melanie's Private Dog Park In Yamhill

Come play or just hang out and relax at our peaceful quiet 3 fully fenced acres with a seasonal creek loads of open space to play fetch or just romp around. There is a kiddy pool available for splashing (seasonally)and a tunnel, weave poles, teeter totter, shute, tunnels and some other toys available. If you are lucky you could see deer elk or even an eagle or the cow's next door. There are chairs to sit in out in the back pasture in the shade. Lots of toys and open space to run and sniff. We do have neighbors with dogs and other animals.