i recently purchased a jack russell puppy she is 4 moths old i already had 2 other dogs the pup and one of the original dogs are ganging up on my maltese terrier and the other night i found her with bite marks and bleeding i didnt see it happen but ithink they attacked her i now keep the puppy and the maltese locked up and let out one at a time with the other dog sadly i am feeling i have to get rid of the puppy any suggestions?