+
Never lose your best friend.
The Fi Series 3+ is the world's smartest GPS collar. It delivers real-time location, escape alerts, and around-the-clock health tracking, all paired with the LUCKY+DOG quality you already trust.
Shop Fi & LUCKY+DOG1 in 3
dogs will get lost in their lifetime
10 million
pets go missing in the U.S. every year
3 months
of battery on a single charge
Peace of mind, on the collar
Built for the moments you can't predict
A door left open. A thunderstorm. A new rescue still learning that home is home. Fi gives you a way to find your dog fast, and to know they're thriving the rest of the time.
Find them fast
If your dog slips out, Fi sends an escape alert the moment they leave your safe zone and shows live, real-time location right in the app.
Travel & boarding
Whether it's road trips, daycare, or a weekend with a sitter, you can keep eyes on your dog wherever they are. Share access with whoever's caring for them.
Health & habits
Fi tracks steps, sleep, scratching, eating, and drinking. Its AI learns your dog's normal and flags the changes worth a closer look.
What makes Fi different
Everything your dog needs
Live tracking with no waiting for the map to catch up. Series 3+ has 2× improved accuracy.
Set safe zones at home, work, or the park and get an instant alert if your dog leaves one.
Tracks steps, sleep, barking, scratching, eating, and drinking, then learns what's normal.
Up to 90 days on a single charge, so the collar is ready when you need it most.
IP68 & IP66K rated for swims, baths, mud, and every puddle in between.
400+ lb pull resistance that holds up to the strongest pullers.
Glance at your dog's location and activity right from your wrist.
Add the whole household, your walker, or your sitter with privacy controls you set.
Store vaccination and health records in the app so they're always with you.
IP68
Waterproof rated
400+ lb
Pull resistance
90 days
Battery life
2×
GPS accuracy (S3+)
Buying the tracker through us
If you're purchasing a Fi Tracker through us, here's what you get
Includes the Fi GPS unit + 6-month subscription + a personalized 
collar band
collar band
Includes:
Fi GPS Tracker
6-Month Monitoring Subscription
Personalized collar band
collar band
The subscription is automatically billed $99 semi-annually plus a one-time $20 activation fee ($119).
Free engraving on every band — up to three lines of ID, so you can ditch the clunky dog tags and that annoying jingle.
Please note
- For orders with custom engraving, shipping times may take slightly longer.
- Your engraving data will be formatted exactly how you type them, so check your work.
- Collars with custom engraving are not returnable, but are fully covered under warranty for defects. If there is a sizing issue, please let us know and we'll do our best to remedy the situation.
- These collars are never intended for tie-out.
What's included in your membership
- Series 3+ Kit with LUCKY+DOG collar
- Series 3+ collars come in 1" or 3/4" width
- Unlimited AT&T LTE-M connectivity
- Fi Series 3+ Extended Warranty
- Unlimited warranty replacements on active memberships
- Unlimited software updates, so Series 3+ keeps getting better
- Live chat customer service, available 7 days a week
Handmade in Austin, Texas
These collars are made by us, for you and your dog. We fulfill every order ourselves, which eliminates extraneous shipping.
