I have been having a little problem with my horses lately. They have been drooling.... A LOT.... I know they get into weeds like white clover and stuff, but this has been going on for like 3 weeks, and I am starting to get worried. When they drool it isn't all the time but when they do it, it almost is as if they are vomitting it up (Not possible, I know) but that is what it looks like. Could it be from anything else? And what can I do to make it stop?