I was really tempted to say Staffordshire, but it didn't feel right.Ok, so here's the list on my guy. This will make you laugh. Rottweiler, Rhodesian Ridgeback, American Staffordshire, toy poodle, english springer, english toy spaniel, curly coated retriever, and belgian sheepdog.
Rhodesian seems so wrong; there would be more red and some ridgeback genetically.
Toy poodle and curly coated retriever don't fit either or he wouldn't have that coat.