Oh no! Not Dah-Wee!!
I remember when I met Herman and I noticed that he was 'supermodel-like' just as you had said. Nipo is 9 lbs. and some ounces, but on her frame the weight makes her appear more 'plush' than Dah-Wee.
I hope it's just an easy-to-cure infection that he has been hiding from you...as cats are known to keep any illness a secret!

Lots of good thoughts and prayers for Dudley, Mom & Grandmom!!! Please update us when you can!