11 Jack Chi Facts. The Jack Chi is still a very new dog and, unlike the breeds utilized, the history is only just beginning. This pet dog has actually lost a lot of the energy of the Jack Russell Terrier and gotten by the mix with the Chihuahua and is a more calm pet. They have been bred to gain a new type of family pet dog instead of the older kind of working pet dog. #puppy#puppylove#puppygram#puppydog#puppyoftheday#puppies#puppiesofinstagram#puppiesofig#puppiesforall#jackchi