I feel like I am running one, albeit temporarily. And I can say right now, that while the two of them (my dog, Sierra, and our friend Sean's dog, Willow) are getting along famously, I am glad I didn't decide to get another dog permanently!

Too small of a house for two active animals. (Sierra is a border collie/shepherd mix and Willow is an American bulldog/lab mix). The cool thing is, NOBODY messed with me when I walked both of them past our local watering hole. Willow looks like a pit bull (but she's not) and people freak out. It's pretty funny. They're both romping with our neighbor across the street's grandkids now. He put the punt dogs in the house so the kids could play with fun dogs.They're still barking, though!