Jen,

I'm glad you thought to check out that towel!

No offense meant, but have you finished each prescription of Clavamox when given? [Lots of people stop giving antibiotics as soon as their pets seem better, but the bacteria are still lurkin' ...] [Not that you are one of these]

He may not be drinking enough water or may not be using the k-box often enough ... is someone else interfering with his k-box priveleges?

Blessings & best of luck. Hope Sterling is soon feeling better.