i have a staffie and a JRT, the jack russel is i little twit and eats all our post, still does the odd sneaky dirty around the house. the staffie is the most chilled out dog you could ever imagine.. crazy when the jack is 6 year old and should have chilled out a bit now and the staffie is still a pup really at 2 year old..
what breed is your dog, bull mastif?