Had many bull xs over the past years when I have had them never had any problems what so ever towards other dogs, humans etc. Other then one dog I had called Zack he was a straight half x collie grey(Hancock) the thing was a c**t towards dogs had to pts in end as just couldn’t trust him around family and exs children. Was a superb worker day and night just couldn’t take the risk either with a heavy vet bill or grabbing a child. He’s long gone but ye that’s my only 1 experience with a aggressive mutt. Atb Jamie