Hi
I think it is best to stick to a high meat content diet for Bengals a very good one is a brand called Orijen. It is completely grain free others that seem to be pretty good I believe is, Science Plan, Royal Canin, so anything that is high quality would be fine.
Some american breeders seem to be using raw as a supplement as well as a good quality dry food. I think that is because it is more of a natural diet as some dog breeders use tripe as it is much better nutritionally for the animals.
I myself am looking into adding raw as a supplement in the near future will def do a post with the results
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