I was thinking about your posts concerning AB + Working Airedale Terrier today, Mike. I was at a close friend's farm in Michigan, not more than 30 miles from Ann Arbor. They were asking about dogs and I mentioned working Airedales, Irish Terriers and, of course, crosses. They mentioned coyote issues and they see them in groups of threes so I suggested exactly what you are interested in: working American Bulldog into a working Airedale. They were so enthused about the idea that he wrote down The Working Airedale Terrier site as well as Molosserdog website. I think the combination would make a very hardy farm dog.