The FitBark and Whistle are both dog monitors. While the FitBark is geared particularly towards activity and health tracking, the Whistle is geared towards GPS tracking as well as activity. They definitely do have some differences and it really depends on you and your dog as to which one is a better fit.
The FitBark is a very lightweight, easy-to-use dog activity monitor. It’s simple to charge, simple to see stats, and it has an attractive bone shape design. It shows “BarkPoints”, sleep scores, and calories. You can even see your dog’s stats from the last week or month at a few taps! To learn more about the FitBark, click here.
The Whistle is both an activity monitor and a GPS tracker. This means that the location of your pup is always right at your fingers! A GPS tracker is useful for dogs who tend to explore past the fence without your knowledge. The Whistle also does track activity like the FitBark. To learn more about the Whistle, click here.
Here is the FitBark vs. the Whistle lowdown:

