Pit Bulls are....
you just never really know......
My GSD hasn't a mean bone in her body, no muzzle at the vet or groomer. But come into my wifes work when she "on the job"....get out of line she's threatening to take a limb off. NO ONE...messes around near the dog!
My neighbor has a Pomerainian (sp?).....muzzled when out....will bit anything that moves!