Our dog, Bob, is half Jack Russell, and the other half is divided between Rat Terrier and Blue Heeler. He is a very sweet, smart dog. Very bossy with our Cairn Terrier. He "heels" me and our other dog, Duke, everywhere he wants us to go! The antics of these two are endless. We went from 30 years of Labradors. A lot of activity and energy at our house. We were thinking small dogs would be less trouble. Not really... but we love our crazy terriers! Hard to make informed decisions when they are so stinking cute! Do over, would bring us back to Labs. Spend time researching dogs and knowing yourself and your lifestyle! Long term commitment! And enjoy!!!