As a practical matter, how do you tell the difference between a Bull Terrier and a Pit Bull?
They look nothing alike, for starters.
:D
Bull Terriers are a Dolichocephalic breed, having a long head, which is described as either ovoid or ‘egg shaped’.
“Pit Bulls” [no such official “breed”, really] are Brachycephalic and their skull is relatively broad and short.
(typically with the breadth at least 80% of the length)
The only vague similarity is the short, stocky body.
“Pit Bulls” were really created mixtures of Staffordshire Terriers [American or English] combined with other breeds.
Years of show ring breeding, with its mania for extremes, gave us the modern skull of Bullies, like this one
[pinging Tristan so my face can be rubbed in the fact that *I* do not have a Bully, too] :D