Tractive's CAT 6 Mini adds resting heart and breathing rate to a GPS cat collar

At a glance

Best for: indoor cats whose owners want resting heart and breathing rate beside GPS.

Skip it if: your cat roams, where one reviewer would pick the Fi Mini, or weighs outside 3 to 8 kg.

Reviewers agree: the collar is comfortable and the health tab is useful on indoor cats; neither tested a roaming cat.

Molly Higgins checked Tractive's CAT 6 Mini the old-fashioned way, timing her cat Basil's breathing on a phone. The collar's daily average of 20 breaths a minute closely matched her count and sat inside a normal range of 15 to 30. That's the new trick here: next to GPS location, the tracker reports a cat's resting heart and breathing rates. Her month-long review ran in WIRED on 1 October 2026.[1] [2] [3]

The CAT 6 Mini folds the tracker into a breakaway collar, 32 grams with the collar and designed for cats of 3 to 8 kg, according to Tractive's page re-read on 1 November 2026. Cats.com's Katelynn Sobus describes location from GPS and a built-in SIM card, with heart and breathing data in a health tab beside activity and sleep. It needs seven days of wear to learn what's normal for your cat, and a subscription, billed annually. Tractive says it flags changes and leaves diagnosis to a vet.[3] [2]

Basil's resting heart rate gave Higgins something to follow up: on one day it read 92 bpm against a normal range of 105 to 168 in the app, which also lists possible reasons such as fitness and cold temperatures. She plans to raise it at the next vet visit and thinks aging cats would gain most. Sobus, whose cats are all over 12 and who received her unit free, calls the CAT 6 Mini one of the best cat trackers she's tested and would buy it for health monitoring alone.[1] [2]

Sobus found the slim collar comfortable on her indoor cat, with quick charging and good GPS tracking on her outings. Higgins's collar needed charging by day four, which means taking it off the cat; when it travelled without her phone, safe-zone alerts took from under a minute to about eight, and about once a week the app said Basil had left while he sat at home, though she notes poor cell service near her home.[1] [2]

Tractive's DOG 6 shows heart and breathing rate too: CNET's Corin Cesaric-Epple reports that its app shows both, plus barking, after a full week of wear. The DOG 6 took best overall in a roundup that gave each tracker roughly two weeks, and Treeline Review's Jae Thomas, testing for months with two Colorado dogs, got up to 25 days from a charge against 14 advertised, with collars off indoors. Both cat reviewers used indoor cats; for a roamer, Higgins would choose the Fi Mini. Before buying, check weight (3 to 8 kg) and neck (19 to 22.9 cm), then give it the first week before reading the vitals.[4] [5] [3] [2] [1]