Don’t let this sad look fool you. Molly doesn’t really mind her sweater, and with temperatures in the 20s today, she even likes it.

I put it on her so we can go for our daily walk, and while we circle the neighborhood, we’re using a new, free app to track our steps. It’s called WoofTrax, and it’s available for iPhone and Android. It’s a great way to support your favorite animal shelter or rescue group.

All you do is download the app (did I mention it’s free?) and select one of over 4,000 organizations you want to help. The app’s sponsors donate for every mile you rack up. WoofTrax says the donations also come from advertisers and investors. Of course, the more people who sign up to walk, the more money the charities receive.

So grab a leash! And put a sweater on your pup, if it’s frosty out there. Walking is one of the best exercises you can do, and besides–every step helps make life a little better for our furry friends.