In an effort to be inoffensive to ladies, unneutered male animals used to be referred to with some strange names. I imagine the idea was that ladies wouldn’t have any idea about castration, and even if they did, wouldn’t be expected to acknowledge their knowledge.
Editorializing aside, a cat able to exercise his inner-lion’s sexual behaviour was called a boar cat. Further research suggests that boar (from ME and OE) was indisputedly the male of swinedom, leading to later use in referring to male animals who were predatory, aggressive, and omniverous - encompassing most of the cat world, including the largest leopards. There were boar raccoons as well, as raccoons are also known as fierce fighters. The term boar to distinguish male from female was in use for the Ramboesque qualities it conjured up for many English speakers.
We seem to have stereotypes for animal terminology meant to emphasize the perceived aggressive nature of other species, so males of many species are called Boars and Bulls. Whales and sharks, even.
Edit: Typing is not my strong suit, so I didn’t see the two posts above. Bah.