Taking a breather

An unusual event - Jess taking a breather on a dog walk. Must have been that partridge/pheasant/hare she chased across the field....

I take her on two walks, and I average between 3-4 miles a day. I reckon she must run 15 miles at the same time.

I'd love to put a GPS on her to find out. Does anyone make that sort of thing?