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We must have dofferent vets then cause their prices are cheaper than any vet here + animates..

I tried that, my husky could sort biscuits she would eat from those she wouldn't on "the fly" she would spit the SD out while swallowing the others. I mixed a bag of Royal Canin (which she would eat)...

we chop and change dog food brands/varieties all the time ( not the cheap brands) but it would be unusual to have your problem. Only time I can recall that happening was with some PAL Meaty Bites...