Our English Bulldog, Cheeseburger, was 2 in March. Over the past 2 mos he started doing this weird thing where he'll start sticking his tongue out repeatedly like he's salivating and licking quickly to fight nausea or something. He'll do this sometimes for 1/2 hour at a time (usually before bed - always towards night) and he gets a small amount of white foamy stuff right below his bottom lip. He has also been throwing up small amounts of yellow bile in the morning on occasion. Our vet doesn't know what would be causing this and doesn't think it's a big deal because he seems to be overall ok. He eats regularly, goes to the bathroom regularly. He's always playing and happy - except when he starts this weird licking he looks uncomfortable, and I can just tell something's wrong. What do you guys think? Could this be a strange habbit of his? Anyone have a similiar experience?