Garmin Alpha T 20 Dog Tracker Review
A GPS dog tracker that works off-grid, in the backcountry, and without cell service
August 7, 2026
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Our verdict
The Garmin Alpha T 20 Dog Tracker is one of the few dog GPS collars on the market that works in areas with no cell service. It’s easily the most reliable GPS collar we’ve tested so far, and is best suited for people who hike, camp, trail run, and overland with their dogs in remote, backcountry locations.
This GPS collar uses radio and satellite signals to connect to a paired Garmin handheld (required, but sold separately) and gives you your dog’s location and distance from you. When connected to the companion app, you can also see maps, past routes, and more.
We tested the Garmin Alpha T 20 collar with the Garmin Alpha 10 handheld over months of hikes, camping trips, and off-roading adventures everywhere from the Utah desert to high-elevation mountain passes in Colorado. The fast loading times can update you on your dog’s location anywhere as fast as every 2.5 seconds.
However, this collar lacks some of the health and activity tracking features of cellular options like the Tractive Dog 6 GPS collar, and it’s not suited as an everyday or “always on” type of collar. For those who adventure often, have active hunting dogs, or live in remote locations, though, this collar is highly reliable if you’re willing to tap into the Garmin ecosystem.
Garmin Alpha T 20
Learn more about our top picks and what to consider in our Best GPS Dog Collars guide.
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Garmin Alpha T 20 Specifications
Price: $300 (collar only) plus requires a Garmin handheld like the Alpha 10 ($400)
Subscription plan: None
Tracking speeds: 2.5 seconds, 5 seconds, 10 seconds, 2 minutes, dynamic
Battery life: Up to 68 hours depending on tracking speed settings
Water resistant: Yes, 1 ATM rating
Weight: 8.4 oz
Cellular networks used: None, GPS and Galileo satellite connections used, plus radio connection between the collar and the handheld
Comparison table
| GPS Dog Collar | Battery Life (Tested) | Coverage Type | Waterproof Rating | Weight | Best Use | Subscription Required? | Device MSRP |
|---|---|---|---|---|---|---|---|
| Garmin Alpha T 20 | 68 hours | Iridium satellite network | 1 ATM | 8.4 oz with transmitter, antenna, and collar | Backcountry, hunting | No | $300 + GPS |
| Garmin Alpha LTE | 75 hours | VHF or LTE | 1 ATM | 1.8 oz | Outdoor adventures, urban activities | Yes | $300 |
| Tractive Dog 6 Smart Dog Tracker | 25 days | GPS + LTE | IP68 | 1.4 oz | Outdoor adventures | Yes | $79 |
| Fi Series 3+ | 10 weeks | AT&T LTE-M | IP68 | 1.3 oz | Advanced activity tracking, outdoor adventures, urban activities | Yes | Free w/ subscription |
Best for
Folks who hike and camp with their dog in backcountry areas with no cell service
Larger dogs (40+ pounds)
Dogs who are primarily off leash
Those who don’t plan on keeping a GPS collar on their dog 100% of the time
Those who don’t need dedicated activity and health tracking features
Bird dogs or hunting dogs
People who have a Garmin watch that supports the DogTrack feature, such as the Instinct, fenix, Epix, and Tactix
What we liked
Works in areas with no cell service
No monthly subscription fee
Long range of tracking (up to 9 miles)
Fast tracking refresh rates
Simple handheld experience
Can be paired with the Garmin Alpha LTE for unlimited range
What could be better
Collar is heavy and bulky—best for larger breeds
Handheld is also a bit bulky
Requires separate purchase of a Garmin handheld
Doesn’t have health/activity tracking features
Initial setup has a steep learning curve
Battery could be better
Expensive upfront cost
How we tested
We tested the Garmin Alpha T 20 over months of hikes, backpacking trips, and hiking excursions with two dogs on the Front Range and in the mountains of Colorado. Our mileage ranged from three mile after-work weekday hikes to multi-day backpacking trips at high elevations.
We tested this GPS dog collar on two off-leash dogs with different hiking styles: one who ranges further and another who stays close to her people. We compared the connection and battery range based on the two different activity levels (the independent dog generally does more mileage). We also used this collar at the same time as the Tractive Dog 6 and the Garmin Alpha LTE to compare location accuracy.
We tested the radio connection between the collar and the Alpha 10 handheld at varying distances and in different terrain, and evaluated the user experience of the handheld and companion Garmin Alpha app. We also tested this tracker alongside similar models in our Best GPS Dog Collars guide.
Performance in the field
Location accuracy and speed
We compared the different location refresh speeds and the dynamic setting, and all were similarly accurate, giving you a measurement of how far away your dog is (in yards) with an arrow pointing to their location.
During testing, we noticed that this collar works best and is more accurate when your dog is farther away from you. If you have spaniels, pointing breeds, or other wide-ranging dogs that need to run big, this collar is a good way to keep tabs on them while also allowing them to get their zooms out.
Don’t expect this collar to have pinpoint accuracy of where your dog is. The location arrow shows your dog’s distance from you as the crow flies. If there’s hilly terrain or a winding trail, the Garmin Alpha T 20 shows you the shortest possible distance from you to your dog, not the actual trail distance.
You can view how far away your dog is on the handheld, but the measurements aren’t always exact.
Though satellite dog GPS collars rely on a radio connection to connect with their paired handhelds, we didn’t encounter any instances where the handheld wasn’t able to connect to the collar. It’s said that bad connections can occur if your dog ranges far in rocky, rough terrain. Our tester dogs generally stayed too close to us to test this, and most well-trained off-leash dogs (with the exception of hunting dogs) shouldn’t get far enough that connection between the collar and the handheld is an issue.
Connection
The main perk of the Garmin Alpha T 20 in comparison to other dog GPS collars on the market is that it doesn’t require a cellular connection (or the associated fees that come with cellular connections). That means, it works deep in the desert, high in the mountains, and far into 4x4 roads where there’s little or no cell service.
This collar worked with 100% accuracy on multi-day backpacking trips where there was no cell service, and we have yet to see an instance where it doesn’t offer super fast connection.
App and handheld usability
The setup of the handheld and collar isn’t that complicated but can be intimidating. You need to pair the collar with the handheld, then calibrate the compass on the handheld. You should also download the Garmin app for your specific handheld and pair your handheld with your phone. Setup of the collar and handheld needs to be done outside with a clear sky view, so it’s recommended to do this at home before you head out on your first hike, as it takes around 5-10 minutes to get it set up for the first time.
Once it’s set up, using the handheld or the app is very straightforward. You can add the location of your car/truck to view distance from your parking spot, you can start “a hunt” which begins tracking your dog’s location. There aren’t many features on the handheld, so it’s easy to read where your dog is and where your truck/homebase is.
The handheld will also give you hunting alerts if you’re using it for hunting, and will let you know if your dog is engaging in hunting behaviors like treeing and pointing.
On the app, you’ll find some extra features. You can view your dog’s visual breadcrumb map and see your location on a map that’s not visible on the handheld. You’ll also be able to create routes, save waypoints, and view your “hunt” history.
Battery life
If you only use the collar while you and your dog are actively hiking, the battery life is decent. On a recent backpacking trip, my dog wore her collar for around 5 hours while we were hiking (I took it off while we were at camp and at night) and the battery dropped less than 10%.
Garmin says that the battery life lasts up to 68 hours, but the battery life heavily depends on how you and your dog are using it. Long-ranging dogs who are more active and who need a more frequent update rate will run the battery down faster than keeping the collar on the dynamic tracking rate for dogs who stay relatively close to their people.
Garmin Alpha T 20 Features
Companion App / Handheld
The companion app has more features than the handheld, but note that you still have to have the handheld on your person to use the companion app. You’ll unlock topographic maps, hunt history, and course creation via the map that aren’t available on the handheld alone.
Note that you can also use the DogTrack feature on compatible Garmin watches to relay the location data from your handheld to the watch instead. You still need to have the handheld on you, but this option makes it so that you don’t actually have to hold it, and can instead just look at your dog’s location on your watch.
USB-C Charging
The Alpha 10 handheld is USB-C compatible for charging. The Alpha T 20 collar has a separate charging piece that needs to be attached to the collar in order to charge it. This piece is mildly annoying as, if you lose it, the collar can’t be charged. Once the extra piece is connected, the collar can then be connected to a USB-C cord for charging.
Variable tracking rates
The Garmin Alpha T 20 has a variety of different tracking rates: 2.5 seconds, 5 seconds, 10 seconds, 2 minutes, and dynamic. The faster the selected tracking rate, the faster your collar’s battery will run down. The dynamic rate helps with battery conservation, as it adjusts the tracking rate based on how far/how active your dog is.
Collar fit
Note that the collar the Alpha T 20 device comes installed on is quite bulky. It’s not suited for small breed dogs, and it doesn’t allow you to choose your own dog collar to attach the device to, like the Garmin Alpha LTE or the Tractive.
Understanding GPS dog collar features
LTE
LTE is cellular service, like you use on your phone to connect to the internet when there’s no WiFi available. GPS dog collars that use cellular service connect to Verizon, AT&T, or T-Mobile networks (or a combination of the three) to track your dog’s location. These types of GPS dog collars typically require a separate monthly subscription fee, and the fees are paid to the collar brand through a subscription, regardless of which carrier the collar utilizes.
LTE dog collars can only update your dog’s location and activity stats when they’re within range of a cell tower signal, and they won’t work if there’s no service available in your location. Collars that can connect to more than one carrier’s cell towers are likely to have better coverage than options that can only connect to one carrier’s service.
Satellite
Satellite GPS dog collars use satellites in space to track your dog’s location. These GPS dog collars work in areas with little or no cell service, and are ideal for backcountry hikes, camping trips, and overlanding adventures. They’re typically more expensive upfront, but they don’t usually require monthly subscription fees like LTE collars do. Satellite dog GPS collars sometimes require the purchase of a separate handheld device (like in the case of the Garmin Alpha T 20), and the collar connects to the handheld with a radio connection.
Radio
Radio connections typically connect satellite GPS dog collars and their paired handheld devices. Radio connections can sometimes be less reliable in rocky terrain, in areas with dense tree cover, or past certain distances. The radio connection on the Garmin Alpha T 20 works when the collar and handheld device are up to 9 miles away, but won’t work at further distances. LTE collars on the other hand, typically have no range so long as the GPS device and the phone connected to it are both in service.
Should you buy the Garmin Alpha T 20 Dog Collar?
Buy if:
You regularly hike your dog off-leash
You camp, hike, or backpack in areas with no cell service
Your dog is 40 pounds or larger
You only want to use a GPS collar for bigger hikes and trips
You don’t want advanced health or activity tracking
You don’t want a GPS collar with a monthly subscription fee
You have multiple Garmin devices and like the Garmin ecosystem
Skip if:
You want a GPS collar to use on a daily basis
Your dog is smaller than 40 pounds
You typically stay within range of cell service
Your dogs are usually on a dog leash
Where to buy the Garmin Alpha T 20 Dog Tracker
The Garmin Alpha T 20 Dog Tracker is a popular gear item, so you have options when it comes to retailers. Here are the pros of major retailers.
Amazon
Pros: Free 2-day shipping with Amazon Prime membership (can be same-day delivery in major metropolitan cities)
Garmin
Manufacturers may offer more selection, sizes, or colors. It may be easier to make a warranty claim due to a defect.
Advice on where to buy
In general for gear, we recommend purchasing from a place with easy or free returns.
Similar GPS dog collars
Garmin Alpha T 20 vs. Garmin Alpha LTE
Price: $300
Subscription plan: Required, $4.99 per month
Tracking speeds: Location updates every 10 seconds, 2 minutes, or dynamic setting that varies based on dog activity
Battery life: Between 11–75 hours depending on use and if it’s connected to another Garmin satellite GPS collar; around 12 hours of battery life for 10-second tracking rate, 18 hours for the dynamic rate, and up to 45 hours for the two-minute tracking rate; battery life extends to up to 75 hours when paired with a Garmin satellite GPS collar
Water resistant: 1 ATM
Weight: 50.8 grams / 1.79 oz
Cellular networks used: AT&T and T-Mobile
The Garmin Alpha LTE is a cell-service based collar that can be added onto the Garmin Alpha T 20 for unlimited range, like if someone else takes your dog out on hikes for you (the Alpha T 20 only tracks when it’s within 9 miles of the paired handheld device).
The Alpha LTE uses two cellular networks, and gives you location tracking through a smartphone app. The tracking is fast and reliable, but this device is another no-frills option.
The app experience of this collar isn’t as user friendly as other GPS dog collars we’ve tested. It also lacks many of the features the other cellular-based options have, like activity tracking, boundary alerts, and health tracking. The battery life is also fairly short, and it’s not compatible with every collar.
The Alpha LTE is best-suited for dog owners who are deeply invested in the Garmin ecosystem, and don’t mind not having advanced activity and health tracking features.
Read more about this dog GPS tracker in our Garmin Alpha LTE review.
Garmin Alpha LTE
Garmin Alpha T 20 vs. Tractive Dog 6 GPS Tracker for Dogs
Device cost: $79
Subscription plans:
Basic plan: $144 every 2 years, or $108 billed annually
Premium plan: $120 billed annually, $168 billed every 2 years, $300 billed every 5 years
Tracking speeds: Between 2 and 60 minutes for default tracking, between 2-3 seconds for live tracking
Battery life: Up to 14 days, but lasted 25 days during testing
Water resistant: Yes, IP68
Weight: 1.4 oz
Cellular networks used: LTE CatM1
The Tractive GPS dog collar was the overall winner of our Best Dog GPS Collars guide, and it’s a pick that sits at the intersection of reliability, affordability, and functionality. It has a long battery life that lasted almost double the advertised time during testing, and it pairs with a user-friendly app that offers a ton of activity, location, and health tracking features.
The Tractive requires cell service to work, unlike the Garmin Alpha T 20. However, it utilizes multiple LTE networks, so you’re more likely to have connection than other options that only use one network (like the Fi).
This tracker boasts fast connection times, and has a live tracking feature that gives updates on your dog’s location in the app every 2-3 seconds. This feature works slightly slower when the service isn’t as good, but would work wonders for tracking a lost dog. It does, however, drain the battery much quicker than the standard dynamic tracking setting, which updates the location between every two to 60 minutes depending on your dog’s activity.
It also features boundary alerts, so you can set safe zones for your dog, and get notified to your phone if your dog leaves those zones (ideal for escape artists).
The Tractive is an everyday collar for dog parents who want to keep track of their dog’s steps, health, and location, and who mainly stay within range of cell service. The Garmin Alpha T 20, in comparison, is geared more towards backcountry adventure use.
Learn more in our in-depth review of the Tractive Dog 6 GPS Tracker.
Tractive Dog 6 GPS Tracker
Garmin Alpha T 20 vs. Fi Series 3+
Device cost: Free with subscription
Subscription plan:
Six months: $99 semi-annually
One year: $189 annually
Two years: $339 biennially
Monthly: $19/month
Tracking speeds: Updates around every 5 minutes by default, but updates every few seconds in live tracking mode (official timing not listed, but a 2025 update made big improvements to update times)
Battery life: Up to three months, but lasted about 10 weeks in testing
Water resistant: Yes, IP68
Weight: 1.3 oz without the collar
Cellular networks used: AT&T
The Fi Series 3+ is very similar to the Tractive, but has more robust health and activity features, and was a little less reliable service-wise in our testing.
The companion app features sleep tracking, strain rates, step tracking, behavior tracking, and more. The app is also like a social media network for dogs, and shows you activity scores and rankings for other dogs in your area, and other dogs of the same breed as yours. It makes for fun competitive fitness for you and your dog.
Arguably the best feature on the Fi collar is the automatic walk tracking. When you and your dog leave your designated home zone, the Fi begins walk tracking on its own, so you don’t have to go into the app to begin a walk or hike. It also differentiated between activity (like walks, runs, and hikes) and drives, so you can see where your dog walked versus when they were in the car with you.
The Fi collar is lightweight and isn’t too bulky for smaller dogs, but it requires you to either use the collar that it comes with, or to buy a collar or adapter that’s compatible with it. It also comes in a smaller size (Fi Mini) for small breeds or cats. Read more about the Fi Mini in our guide to the best GPS Dog Collars.
The Fi collar had slightly slower connection speeds than the Garmin LTE and the Tractive during our testing, and only utilizes one cellular LTE-M network (AT&T) in comparison to the Tractive’s three cellular network usage. Of course, the Garmin Alpha T 20 is still the best option for those who are regularly out of cell service range with their adventure pups.
Read more about the Fi Series 3+ in our guide to the best GPS Dog Collars.
Fi Series 3+
Why you should trust us / About the author
Jae Thomas has written and edited numerous pet and lifestyle product reviews for sites like CNN Underscored, Whole Dog Journal, and more. She was formerly the shopping editor at Mashable, covering tech and lifestyle products before leaving to pursue her incredibly niche passion of dog product testing. She has a journalism degree from NYU, and has been involved in commerce writing since graduating in 2020.
Jae is also a dog trainer, dog show exhibitor, dog sport competitor, and has worked as kennel help and as a dog show assistant in the past. She teaches both behavioral lessons and sport classes, and competes in AKC conformation, rally, agility, barn hunt, and herding with her two dogs.
Jae is an avid hiker, overlander, and camper, and where she goes, her dogs go. From boondocking in Moab to enjoying the extensive trail system in Boulder where they live, Jae’s two dogs are always with her, and they’re usually off leash. Though they’re both well-trained, being off leash inherently poses some risks, and Jae has used GPS trackers on both dogs for years now on all their travels, just in case one of them ever gets lost.
Find more of Jae Thomas’ reviews and guides here.
