I think the best thing is to look at what researchers feed the cats they work on. I know, animals in research, but it should give you a good idea of what to look for. Researchers want the healthiest animals they can get and they will be feeding them a food formulated to be balanced and healthy.
For dogs, I know most labs use purina dog chow. Thats what I feed my little furry kids and they are in excellent health.
I think the difference comes in if your pets are ill. If they need a special diet for kidney, liver or heart problems, etc...maybe then the difference brands offer something better.
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Maybe it was over when she chucked me out the Rover at full speed.
Maybe Maybe...
~a-Ha
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