Poor guy, he's had a week of it! I'm thinking maybe kennel cough? Cassie came down with it the week after we adopted her & she gave it to Daisy, so we had a few weeks of it here last year. Mine sneezed, coughed (occasionally) and had sniffly noses & watery eyes for a week or so. It can get worse than that for some, but our girls were just a little quiet & drippy. Sam went into rescue with a nasty case of kennel cough, but he was horribly malnourished, so it hit him much worse. If you are quite certain that Titan hasn't inhaled something that's irritating his nose, then I'd guess that it's kennel cough. Assuming that he's eating, drinking, perky & otherwise seems ok, I'd probably just watch it over the weekend and then decide if he needs to be checked on Monday. If that changes though or he's running a fever, you might want to have it checked before then. In our case, Daisy & Cassie didn't need to go to the vet, for them it wasn't a big deal at all. Since I didn't know what to expect, I was about to take them to the vet when I talked with Pyr Rescue about Sammy and they told me that kennel cough is usually like a cold for us and just what to watch out for, so that's what I did. Oh BTW, kennel cough is contagious, so I was just careful not to allow my dogs around other dogs until they were over it.