Everyone else has already praised the colouring texture here to high heavens and I thoroughly agree with their assessment.
I love the blotchiness of your shading and how his tan markings seem to glow from the black. Coonhounds are indeed lovely dogs and fun to draw.
That said, I'm not gonna lie, I am severely creeped out by those eyes. I don't know whether this is just a personal thing with me or not, but I would say that if you've got a dog in a realistic style, giving it humanish eyes = creepy. (The poster for the recent remake of the Shaggy Dog scared me for the same reason.) Real dogs' eyes don't look like that, and it just really disturbs me to see human eyes in an otherwise realistic and gorgeously painted animal's face. Still, nobody else seemed bothered by it, so possibly I just look at dogfaces too much and get too used to the natural look. xD Also, if you meant it to look that way then by all means ignore me.