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.
I have an 8yr old female JRT named Sam. I also have two children 10 and 5. For the past couple of months if Sam is laying with me and someone (hubby or kids) come near me she growls and in some cases will go after my hubby. It mostly happens at night but its becoming worse. She's always been very close with me but this is becoming a concern. Not sure how common this is or is it due to her getting older. Any feedback would be appreciated. Thank you.