Guinea pigs (apart from the new ones they are being fussy) and the rabbit are all on science selective. We changed to it after one of the piggies had really bad inbreeding problems with his teeth and thanks to the food he never needed another operation on them for the rest of his life. Even if it was only 1 and a half years. The vet told us he would need the op every few months but we changed his food and no problem.

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