We have a 16 month female and a 10 week male. The female has always been extremely hyper. The boy is really laid back almost to the point of being lazy. He did have a bout of diarrhea--but we took him to the vet and he was put on meds. It still comes and goes, but the vet didn't seem to worried. He plays rough with our older female, but when they are separated--he just likes to lay around and sleep. I'm a little worried, because a neighbor made a comment that he doesn't act like a puppy. To tell you the truth--his behavior is warm welcome compared to our older nutball, but should I be concern? Could he be sick? He eats fine--drinks plenty of water--no signs of sickness whatsoever.