Woow how rude they are. Yes I have 5 registered pedigree American Staffordshire terriers. I brought a mussle because one is shy and am doing responsible thing because you cant control other animals. 2 had a fight and needed a little help to readjust there additude to decide if they can be together (supervised of course) or if they cant be together. They said my dogs couldnt be registered because of number. I brought a muzzle and keep one muzzled although there was no talk of human aggression in my dogs. Dont know what they do but they couldnt help me. Maybe an american staffordshire thing.