[theBCnut]

It isn’t common for dogs to retain water unless they have kidney disease or congestive heart failure. However, I just learned from my diabetic brother that people retain about 4-5 pounds of water for each pound of glycogen stored, so maybe dogs do likewise.

As far as Dr Tim’s, it is a good quality food. Any low fat food will have higher carbs. There is no way around that. Fiber is reported as carbs, so you may want to also be aware of fiber content in any food you look at.