I once spoke with a couple who judge field trials. They wound up with an orphaned AmStaff (aka pit bull) puppy that was fostered by one of their Lab bitches. The AmStaff thought he was a Lab and did all the Lab stuff, including retrieving. They used to run him as a field trial test dog, which of course messed with the competitors' heads . . . .
I love it. Am familiar with the breed. They are with our NKC.