From what I've heard the higher body temperature of animals and different genes make them immune to human STDs and the viruses won't be able to replicate in their bodies, but if your friend lets random people fuck their animals all the time or carries something himself there's still a definite risk that something could linger in the animal long enough to jump to you. I'm not a fan of sharing animals, it quickly turns abusive and not respecting if the animal tries to say no.

You'd probably be fine going raw, feels better anyway. But if you're paranoid you can wrap, no judgement...

>>9132 > Does the animal pussy and/or cock kill human STDs No. If you don't know who else has fucked it, wear protection.

There are numerous zoonoses that can be transferred between animals and humans. In regards to sexual encounters, most of these are bacterial infections, though cross-species viruses and parasites are also possible, and even fungal infections in some cases. As well, if there has been previous sexual contact between the animal and a human with an sti/std, the potential for the disease to still be infectious to another human can last for hours or even days. While the animal itself may not be able to be infected by the disease, it can still live inside the human fluid inside their body for time, as long as it's within a relatively human temperature range. For certainty, use a condom. Also, use latex, as sheepskin condoms do nothing for stds. Also use water based lube. Note that this will expose the animal to latex, which it may be allergic to. And, if we're being honest, you're probably going to just bareback it anyway. You'll probably be fine, but it's not guaranteed.