Cats ate fish, and dogs ate meat. The origin of this phrase was unknown. Nevertheless, it had an influence on humans. To many, it seemed that cats loved to eat fish and that they should eat fish.
In fact, this was the opposite of what the domestic cat's ancestors had eaten. The wild cats that lived in the deserts in the Middle East... Where could they find fish to eat? Desert wildcats fed on small mammals, small reptiles, and birds. Their diet did not include fish.