Well, men in relationships are dogs.

No human, male or female has ever shown me the unquestioning affection that my dog did. I think men in relationships have this same bizarre ability to look past all flaws, to put up with immense abuse and even blame themselves for it. Dogs can survive without humans, they're fast, can hunt etc but they go out and catch an animal then bring it back to their human and only get the offal from it. That makes no sense and men, in general, are broken the same way. They have a wider skill set than women, more talents, highers IQs, stronger physique, hell, they're even more creative and they could be soaring but they dedicate their efforts to their 'master', a woman and her children. Even 'traditional' relationships that so many RP people call for a return to are a master-servant relationship where the weak enslave the strong.

And if men are dogs, slobbering, suck up dogs that love themselves less than they love their master, aren't women cats? Vain, stupid, vapid creatures incapable of affection, only around as long you feed them, capable of being hunters but bred through generations of pampering to be completely useless. Most women look in the mirror and see a tigeress/lioness, they don't realize thousands of years of pampering has turned them into house cats. Ornamental creatures that sacrifice nothing, contribute nothing. There are no stories of hero cats, only dogs. Stop feeding you cat a while and see how long it will stick around. There is no gratitude with cats, ever.

Perhaps we are better off as on the high mountains, thinking great thoughts and doing great things, alone as Nietzsche said all great men are. Better that than animal servitude. And maybe that explains why there are cat ladies but there is never a cat guy, no guy keeping a bunch of cats. Perhaps only a woman can relate with such a short-sighted, selfish creature.

EDIT: Expanded on a few points