This app was mentioned in 2 comments, with an average of 1.50 upvotes
my dog gets way more exercise these days as well. Started tracking the amount of miles we walk everyday just playing the game - more than 8km yesterday. https://play.google.com/store/apps/details?id=com.p3group.insight.pokefit&hl=en
australian shepherd by the way
For those on Android: https://play.google.com/store/apps/details?id=com.p3group.insight.pokefit
This app lets you keep the screen on when you're playing Pokemon Go, but uses the normal screen timeout when you're not. It also provides a nifty overlay that shows you how far you've walked during your pogo session, but I usually keep that turned off.