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For what it’s worth, I would advise against rotating foods with a puppy. The reason being they need a very precisely balanced calcium:phosphorous ratio, and rotation might throw that out of whack. For instance, if food B has higher levels than food A, and causes a rapid growth spurt. The only reason to switch a pup is if there is some problem caused by the food, otherwise, consistency is key.

BTW, be very careful about feeding raw fish.