Sounds like what several of my dogs had a habit of doing when their tummies got too empty. Is he eating? This tends to put my dogs off of their food making the problem worse
. Since I've switched to adding canned food with their kibble they eat much better and this throwing up bile problem has stopped here. Do you have any Nutrical or corn syrup (not a great substitute for Nutrical so only use it if it's REALLY needed) just in case he gets into real trouble with this?