Good question! You can check your dog(s)' progress toward reward milestones by visiting our brand new Pet Insight Project Portal here!
You can also keep track of milestones with achievements! Open your Whistle app, and tap the paw icon at the bottom of the app. Your progress towards the incentive milestones can be found in the ACHIEVEMENTS & STATS section, located just under the BREED of your dog. The number of days is recorded in the first row of achievements, on the right-hand side.
Consult the GIF below for a visual example!