I've had people ask me what that slimy coating on my baby is, and I have to tell them that it's dog slobber. My dog loves to lick anything, but especially the baby. He's a very delicious baby.
The dog drools most when he's outside. When I let him back in, he frequently has a long line about 4-6" long of drool coming out the corners of his mouth. Unless, of course, he's moved his head in just the right way. Then it wraps around his snout. I keep Kleenex by the back door so I can wipe his mouth off before he comes back in.