American Bulldog...glass eye? Wondering how common

I'm not too sure about the AB's in the line up. I do remember Princess though. Every time I'd put her lead on and start walking her---every few minutes she would have a dry cough---as if she was clearing her throat. I asked the vet about it but don't remember too much, this was in 2008 or so. It got on my nerves and made me wonder what's in her throat to randomly choke every now and then---i just had to ignore it.... I had a friend put her brother Cowboy on a hog and he caught like a natural....but a month later they gave em back. They said he was too undershot to hold solid. Can't remember his wind ....really solid built dog though.