What is the Jack Russell Terrier like?

The Jack Russell was originally a hunting and ornamental dog and is now a popular family companion. It is enthusiastic, friendly, smart and lively, loyal to its owner, guards the home, catches mice and is wary of strangers. It adapts well, endures harsh cold weather, and has sturdy bones and muscles, rarely falling ill.

But as a family pet it is overly energetic, with high stamina, prone to mischief and trouble, and likes to provoke other dogs when out.