I like the coloring on the dog so far. Very evocative of the breeds you're aiming at. Does he have a dew claw on one hind leg but not the other? And it's on the outside of the leg?
I think that thing on his leg is actually supposed to be a piercing! its like a ring hanging from his leg...I almost removed it as flash!
I'll be watching this with interest as I've recently snagged a couple of the old marauder Rottweiler style dogs for my Dark Elves!