Jim, Otis is a Staffordshire Terrier. They do get lumped in to being called "pit bulls" here in the US, by some, as most all similar mixes do, but they are separate breeds.
Staffies (who have a kinda boxer-type head profile), also known as "nanny dogs" are actually quite different from American Pit Bull Terriers which have a much flatter and more wedge shaped head and muzzle.