HI BILL! Good on you. Personally I would say the Jack Russell, course I am prejudiced considering that is what Penny is. But she is still a pup and will require a lot of patience. They are a lively breed, as is the Rat terrier. Either way, I commend you on taking on this task. You ARE a good man Bill, and not just because of this. Stay That Way.
A Little Paranoia Will Keep You Safe (ALPWKYS) Be a Sheepdog JYD#105