Well, to anyone who is interested, I think I am pretty sure what breed Cowboy is. Pretty sure he is a QH/TWH cross! I rode him for the first time today after getting him home after the vet said it was okay, and he has that fanciest, prettiest, head bobbing gait I have ever seen (Maybe I am a bit biased... lol). Very long strides like a TWH, but he is thick built like a QH. Either way, that's what I am going to call him, haha!