Everyone basically honed in on the same designs. C & D.

The tallness of the ears is what I locked on to.

Edit: A is a close second.

I really think the animated look is the only way to really tell, the cats look brilliant in motion, that's what sells it for me, I feel like the best dog is C, but it feel most similar to cats, so it depends how they end up moving, possibly the black colour makes them too similar to cats too.

D looks the most like a dog to me, but C has a more unique design that I like. The rest kind of remind me of Mickey Mouse's ears (He's gone feral!) Maybe this should be a customization option for the future? Food for thought.