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.
my wife and I have adopted a 8yr old JRT he has spent those 8 yrs in a house and garden only he has also been shouted at a lot. He now goes in the car fine walks fine eats well has stopped spraying in the house.
BUT he is growly and aggresive with my wife even though she feeds him and walks him isnt angry with him but still he is not nice towards her. Any ideas