If your self concious about your teeth, one with no teeth would do the trick too

joking. Some people just dont smile, not because theyre unhappy or dour.. just dont!
I'm pretty sure the ridge is a symptom of spine bifida. So I've been told. But aye he looks like a big dog! Ridgebacks tend to be quite protective dogs, over their owners I found anyway, or children. These ones were anyway! Haha, my dogs tail is like that too, although she never catches me in the balls...