Jack russels can also be gentle. It depends on the breeding. I am partial to mixed breeds for this reason. I have met some very sweet Jacks. But I have a Ha Ha about one. I have a tall male friend and he was in an elderly client's home and the dog was jumping up and down up and down trying to grab his pants. He did, right in the groin. Pants were the only thing injured so it was humerous but I can picture it now. Getting a pet is a very personal decision. It is more about who chooses you.