I still think it is some kind of coonhound...maybe a rarer type that I don't know of..a Treeing Walker Hound or a Red Bone Coonhound, minus the red, lol!
Some said Plott Hound, I think they are brindle...not sure though. I don't see many Coonhounds around here. One Black and Tan, really nice dog!! love him! and a Red Bone Coonhound. He's HUGE...they are both HUGE, really!