Stomps has been making an odd noise lately. It sounds like he's gagging or trying to clear his throat, and it's very loud. He does it once or twice in quick succession, then he seems fine. Just now I found a glop of thick, clear mucous on the floor. I'm not sure it was from Stomps, but he's the most likely source. Has anyone experienced something like this? Otherwise, he seems fine. He's eating well, he's active and he doesn't appear to be in any discomfort. I know I have to take him to the vet, but I dread it because he's so old and I'm afraid of what they'll find.