I've noticed a lot of people rotate their food. Is it necessary or healthy for the dog? Meg has been on the same kibble (EVO small bites) for the last three years and has done wonderfully. We free feed her every day and she's maintained a healthy weight (between 7 and 7.5 lbs.) The vet said he sees a lot of overweight paps in the area and that she looks great. We do give her supplemental food (eggs, meat...etc) maybe once or twice a week. Soooo...is there any reason (beside boredom on my part) to switch foods? I feel guilty since it looks like a lot of owners took their dogs off EVO when they sold to P&G. If there was a change in formula it doesn't look like she noticed. BTW, I need to get recent pics...lol. All of these are puppy pics.