Hi all, thanks so much for your insight. I've not been able to get on since I posted this, but weirdly enough I haven't seen her gag since I posted. Go figure ... She is indeed heavy but she has been since her kitten days -- I have had her on measured food and vet-prescribed diet food at that -- the vet is really surprised that Millie is not losing any weight. She hasn't gained any more, so that part is good. She does not eat anything other than her vet-prescribed food nor any milk or anything else. Possibly hairball is what I'm thinking. But for right now with no gagging in the last few days I will wait this out and see, and if it starts again I will take her in. Thanks for all your concerns and glad to know Millie is so famous with her cat-in-sink photo!