I got two Jack Russell terriers from the Mich JRT rescue assoc. after people saw Eddie on Frazier. The thing is that they are't great dogs for small kids.
Far too many people see a breed on TV or in a movie and race out to get one without thinking. Not good for the people or the dog.
I have a JRT that is a medical marvel. We love him, but he is incredibly expensive to maintain right now. At 6, he has multiple allergies, and currently has his 2nd corneal ulcer.