staffordshire terriers are good dogs, as are pit bulls, which i have 2 of. i have 2 cats they will not touch at all, but i have had both of my dogs bring me back cat presents more than once. they are very good at learning what they can and cant play with. let them know from a young age that cats are his toy and youll do just fine. put in a doggy door for the night times. dogs got the ears and the nose to do the job very well. put motion sensor light out there so the dog knows when a cat nears the pond. then the chase is on and when your dog can run up the tree after the cats, they learn to just Stay the Fuch Away. keeps my cats happy too, cause it keeps the competition away