Usually not much if they only inhaled a small amount. But if they actually eat the stuff, or they inhale too much smoke then, well, they get high. Simple as that. Except it’s not very fun for dogs. They’ll have trouble walking and they may start to pee themselves. Some dogs start to make really loud whining noises, even during their sleep. Another thing to consider: Dogs have far fewer brain cells to burn. So by all means, smoke if you want to, but don’t unnecessarily subject your dogs to it.