I have a friend that has a JRT.
He's the only small dog the I like. She says that god put a tail handle on her dog. lol

He's going over 10 or so years now. He was active but not as mush as you think, my friend shows horses, & her JRT goes with her everywhere. He did since he was a puppy. He's very smart, he knows peoples names, horses names, he helps train horses (he stands behind who ever is working a horse).

I've noticed some propblems with him, like he'll get one flea & he goes nuts, if my friend leaves without him for a few days he wont eat.

I think if I was ever to get a small breed of dog it would be a JRT.

A Jack Russell Terrior & a Rottweiler together, What A Picture That Would Make!