The Jack-Rat Terrier is not a purebred dog. It is a cross between the Jack Russell and the Rat Terrier. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.
""Foxy is my name and playing is my game" I am a 7 month old female Jack-Rat, that is wound like a box spring! I love to jump, run and play and have boundless energy throughout the day. I am smart, quick, and fierce with a glowing personality and a zest for life. -- Our Foxy has been a wonderful addition to our family. Foxy is great with our young boys. She is very adaptable, aims to please and wants to be part of the family activities. And yes, she has an off switch. She can become an instant couch potato. She is the best of both worlds energetic-lap dog. She is wonderful."
ACHC, DDKC, DRA, IDCR, DBR