Its all in the upbringing..... I can tell you from experience to stay away from any of the Breeds with a high Prey drive.... As you JRT's darting action and fluttering behavior can act as a real trigger for dogs with said prey drive. I would go with a more laid back breed... Leonberger, Newfie, andthe like... I dont think that you are experienced enough to handle the dogs Im about to mention, but Ovcharka dogs seem to do suprisingly well with little dogs. PLease Keep in mind.. there are always exceptions to the rule. Just rememer... Upbringing! And Welcome. Lane