Just before I start they are not the best. With his big sister. They tolerate each other now. JK they even play together. Junior's starting to muscle up a little. He's gained a few needed pounds, but that's big for him. He came to us a little less than 12 lbs and the vet wants him at around 16 to 17 lbs of pure muscle. He gets LOTS of fetch, his version of a springpole, walks, running, and jumping.