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.
Yelping in heat?
I have a 2.5 year old Jackchi and she's currently in heat. She'll randomly start yelping and shaking. I can't really afford a vet bill and I'm worried. She seems like she's in major pain and she's done this before but she usually only does it before/during a heat. Could it be "cramps"? Is there anything I can do to help her without a major vet bill?