If you want to learn more about training and controlling your Jack Russell, my ebook is bound to save you hours of training trial and error and relieve a lot of stress from the process: The Jack Russell Lover's Ultimate Guide to Training comes complete with a full chapter on mix breeds.
A friend bred his JRT and asked me if I wanted a puppy when they arrived. I kiddingly told him that I might if he had a female that matched my white boxer "Lola" who was about 2 years old at the time. He called when the first, and he thought only, puppy was born and told me she was white with a patch over one eye. I laughingly told him that wasn't a close enough match. About 24 hours later, the second, and last, puppy arrived. My friend called me immediately and told me she was solid white with two patches just like my boxer. It seemed like it was meant to be, so I became the somewhat reluctant owner of a six week old puppy. Irrepressible, fearless and fiesty, she bounded into our quiet lives after a very great family tragedy. Somehow I knew that her name just had to be Joy. She has indeed brought a great deal of joy into my life and the life of her best buddy, Lola.