I have a Two male Guinea pigs I got from a local pet store after the owners decided to give them up, and they been healthy ever since. But lately I've been noticing that one of them (His name is Reese) has been acting strange, and today I noticed that when he took a drink from his water bottle, yellow fluid was pouring out of his mouth, but the other piggie was completely normal. I'm honestly terrified. Anything would help right now.