Ah so you don't want to see many pastoral/working dogs anymore?
English Mastiff, Rottweiler, Doberman's, German shepherds, Belgian Malinois, Giant Schnauzer, Boxer.
So people can only own a terrier or a spaniel?
Terriers can be utter bastards. I had lakelands, and they are a real challenge to train. Mine were fine with almost everything, brilliant around horses and children, and great with people, but they had to be on the lead if there were sheep or poultry about. And I'm no novice and managed to housetrain the (adorable) fuckers in 3 days.
I've known some Jack Russells that are complete nightmares and there's a Scottie near me that some people cross the road to avoid. It goes for people's ankles as they walk past.