Yeah, unfortunately it's a pretty common belief by maybe around 1/4 - 1/5 of zoophilic women. Usually not with human males and male dogs, but usually with human males and female dogs. It simply comes from a place of ignorance, but for many there's nothing you can say that will change their mind. Although I have been able to convince a few that not ALL cases of men having sex with female animals is automatically abusive/rape through prior debates about it.
Unfortunately it kind of is what it is. You can argue that female dogs have all the same parts down there (vulva, clitoris, vaginal tract, etc.) that a woman has, you can tell them that female dogs can and do have orgasms, you can tell them that consensual sex releases dopamine, serotonin, vasopressin, and endorphins, you can state that you're equally against abusive sex in all forms, and you can even show them video proof of female dogs pretty much begging for and enjoying sex with men... but unfortunately you can't always override someone's preconceived notions and biases. All I can do is toss the evidence and information out there, but it ultimately circles back to "You can lead horses to water, but you can't make them drink. You can lead people to information, but you can't make them think."
