I've seen one non-predominantly white deaf apbt, the others I've met are mainly white.
Deafness in ab's is very high, I've seen quite a bit of it. Funny, people had real issues w/dogs that were predominantly colored.
My son's dog, Cyclone, suffers from late onset deafness, which started at about age 6. We had associated w/the case of parvo she developed at 12 weeks. However, we took care of one of her 5 year old sons for a few months, when his owner was being treated for cancer, and he had no problem hearing. He returned to us about a year later, when his owner had passed away. He was completely deaf. So, it was genetic, though we never saw it in any other offspring, nor have I heard of late onset deafness in other lines. Yes, she had predominantly white dogs back in her pedigree, she has a little white herself, and the deaf son's sire was a predominantly white dog, and a line breeding. The deaf son had a fair amount of flash. Figures, too, this female produced OFA excellent from 2 different sires. Flying A bloodline, you don't see it around much anymore.