My friend Jee has a Jack Russell, same story. Alice is 11 now, and still wound up tighter than a drum.

Most terrier breeds have very high energy levels, but even amongst terriers, Jack Russells have the most energy.

According to Dogster.com it's a result of their being bred to hunt foxes

Jack Russell Terrier History:
Jack Russell, an English clergyman, developed the Jack Russell Terrier in the mid-1800s to hunt foxes and other small game. At this time, the dogs were called “fox terriers,” prized for their endurance on long hunts and ability to dig animals out of their dens. The term “Jack Russell Terrier” was coined after Rev. Russell’s death in order to distinguish the small working dogs from the existing “fox terriers,” which were larger. Even today, Jack Russell Terriers constitute a wide range of different types.
Source(s):
http://www.dogster.com/breeds/jack_russell_terrier


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