Just posting a cute picture my fiance sent me of our dog being quite the gentleman with our lizard. I assume you know what breed he is
and she is a Bearded Dragon.
I never let them interact unsupervised eventhough he has been around the lizard since he was puppy, because he is (as I like to call it) "preyful" and her scurrying around might turn out to be bad if I'm not around - but he is super gentle with his big -interspecies- sister