How to Keep a Jack Russell Terrier Happy. The Jack Russell terrier is a sturdy strong breed which can sometimes be aggressive if not trained properly. Like all terriers, Jack Russells have lots of energy and need plenty of exercise to burn.
This dog expert guide gives you all the information you will need to provide your Jack Russell with the care and training that will enable him to lead a happy and fulfilling life. Written by experts, (Boxer Beagle Mix)