Kelcee was on Wellness for a few years, mixed with her Waltham Prescription food. She is 10 pounds and the 2 bags lasted forever, free feeding. Now I have switched her to just the Waltham.
We had the dogs on Wellness also, but there was too much 'waste' in the yard. We thought that maybe they didn't use enough of it, so we switched back to Nutro and they seem to do very well on it.
Katz