I'll be honest, I was listening to the audiobook version of this more out of obligation than actual desire to read it. I was borrowing the 15 Doctors, 15 Stories from a digital library mainly to listen to the 13th Doctor story that had been added, and while I had it borrowed I thought I would catch up on the 12th and 15th Doctors' stories.
All that to explain, I really wasn't in the right mood or headspace to enjoy this one, and mainly listened to it in the background while doing other things. The idea of a planet full of dogs was interesting, and I thought the escaping-from-prison-by-playing-fetch scene was fun. I might have to circle back and reread this sometime when I'm actually in the mood for a 15 and Ruby story!