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.
Jacquelene
My Jack Russell is running back and forth growling and snapping at my face. He seems irritated and has bit me and my mother. Also I have discovered he has worms. Is this maybe what's causing this aggressive behaviour? He has had seizures and this is what he is like after.