Scout woke up from a nap this afternoon and I noticed one of his eyes had a tiny bit of crust in the corner, kind of like what we call "sleep" (that gunk in your eyes when you first wake up.) It's not porphyrin, it was kinda yellowy in color, and I wiped it off with a damp towel since it was bugging me (probably bugged him, too.) Is this normal? This is the first time I've seen it, and it was only a tiny bit in one eye. He's acting normal otherwise and his nose is dry and not running.