Don't know if this is something to be concerned about or if I'm just over reacting. Niko is a drooler but tonight he's been drooling more than usual. Drool is just dripping from his jowls. There are drops of it all over the floor and I even had to make him get off of the couch because he was getting it all wet. It's like a faucet leak...drip, drip, drip. Is there something that could be causing this excessive drooling?