I have had 3 Jacks now and there are 5 in our family. I have had a lot of dogs over the years, Chihuahuas, shepards, labs, pugs, mops, etc, etc. My JRT's are by far my favorites. They are great family dogs, very loyal, very obedient if trained properly. I think their energy is one of their best qualities. I dont believe the horse thing, they are famous for being great with horses, I dont know any "puppies" that wouldn't bark and chase another animal. We use to live on a horse ranch and looked after 38 Appoloosa's, our JRT's use to walk through the stalls and the horses wouldn't even bat an eye. They are recognized in dog books as being good horse dogs. Buy a Jack Russel book and read, if you are an outgoing person, they are great companions, they like nothing better than to go for walks or go travelling. My 2 JRT's go to work with me all the time, they stand with their feet on the door in the morning.
I will admit, they are very dominant when it comes to other dogs, cats etc. If they grow up around other animals they wont bother them much.
My dogs dispise cats, gophers, rabbits, etc, but that is the way we trained them, I dont want strays around.
Good luck, sorry for the long winded.
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, AA
P.S. Yes they shed.