Drinking a lot of water

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Roxy My Love- 12/06-1/08

Attitude with- Bounce
Barked: Mon Feb 11, '08 10:47pm PST 
My 3 year old Schnauzer has started to drink a lot of water...more than usual. I noticed about a week ago that his tummy felt full and tight and I took him to the doctors. They examined him and asked if he was still drinking and eating. He has always been somewhat stealthy but we did see him eating here and there. When the doctor looked at his abdomen, it wasn't as hard as the day I noticed it.
Today again I noticed that his tummy felt hard and he was drinking water like he couldn't get enough.
My baby girl Roxy passed away a month ago so i feel like I am watching my other babies even more...somewhat paranoid.
Any thoughts or suggestions would be greatly appreciated.

The- Anonyshcnauzer- of Leap
Barked: Tue Feb 12, '08 8:44pm PST 
What kind of diet is he on?