I have snakes, geckos, a lizard, a dog and a cat. My cat worries me a lot more than my dog does. She likes to sit and study my snake rack, which makes me really worried. I scare her away from it when I see her there, but because it's in the living room and I work during the days I can protect them all the time. My dog only cares when I have my snakes out because he's not getting attention something else is. I have introduced my dog to a couple of my snakes, but ONLY ones that I know I can reasonably trust. All I do is let my dog sniff them and then I move the hand holding them away. I know my dog and I know he has not interest in my snakes other than to sniff them quickly so I'm not worried about him. He only cares about dog food, tennis balls and pets from mommy so a snake doesn't even fall on his radar as potentially interesting. I don't think I would introduce a dog to a snake if the dog seems interested in it. So long story short, I think it depends on the dog and the snake.