Track Everything with Fi Series 3+ Activity + Rest Hit breed-based fitness goals and catch changes in typical activity and rest patterns.

Waterproof, dirtproof, and designed for the outdoors. Discover our Fi Makers.

Multiple pets? Get 5% off all of your Fi memberships. 30 day risk free trial. 1-year warranty. Online support. 7 days/week on chat or email to answer any questions.

Like an Airtag, but with GPS. Learn more about what makes Fi the best technology ever built for dogs.

The Only App Dog Parents Need Take total command of your dog’s safety and health with the Fi app.

SO MUCH MORE THAN A COLLAR With Fi, you’re not just buying a collar. You’re unlocking a game-changing membership.

Maximum Versatility Fi Mini attaches to any collar, supercharging their one-of-a-kind look with smarter tracking.

Orders Seamless ordering, helpful return options, and rewarding experiences that make getting Fi simple and stress-free Getting Started Everything you need to set up your Fi collar and begin …

Fi Series 3 Plus | AI, GPS, activity & sleep tracking. Wired best tracker for dogs. Join the pack!

Fetch the most advanced GPS, behavior, and activity tracking technology for your pet.