Yes, the Staffordshire Bull Terrier was originally bred to kill
rats for pest control and organised ''ratting'' competitions.
However, I have a Staffy and two pet rats and my Staffy is scared
of them! There are many breeds that were bred for vermin control,
including the Jack Russell Terrier, Parson Russell Terrier,
Yorkshire Terrier, Norfolk Terrier, Lakeland Terrier, Miniature
Schnauzer, Border Terrier, Patterdale Terrier and many more. In
fact, pretty much all Terriers were originally bred to kill
rats.