A general approval for bestiality (actually beastiality it is) should never be given, no woman should allow an animal to mount her as it is insult to humanity. But a man having sex with a female dog or a female horse may be permitted as long as the animal is not subjected to force as these two animals have long been associated with human society and have been domesticated for ages.
Sounds like you have a very twisted view of sex. If a man can have sex with a female dog or horse, it's fine for a woman to have sex with a male dog or horse.
Maybe you're insecure? Are you afraid that she'll like the dog or horse better than human males? Lol.