I do agree with Scott on that.
I have a female catchdog, although not APBT, She is bred for Catch and brains but has drive like crazy we have channeled that drive and her nose is becoming pretty incredible. I am using her for blood trailing last track we worked was 6 hours at 458 yards.
This dog is bred for speed, stamina and power, what do you think a dog that can take a 6 hour old deer track could do on a stinky hog?
she is not a ABPT but YES I believe you can go find one that has this ability that has the papers if you want too, but you have to push alot of egos out of the way and get down to to the dogs themselves.
What kind of dog is she? You got me wondering.