Horse can consent
For starters I don’t want to have sex with a horse, but I’ve ridden horses my whole life and I’ve thought about this a bit just in terms of their behaviour. Hear me out.
Horses are easily spooked. Even if your horse loves and trusts you, you can still spook it. Regardless of whether it likes you or not in a moment of anxiety it can seriously hurt you. Horses (unlike bulls) are known to exit the situation rather than hunt you down but they’re still very dangerous. You always need to be on your toes around a horse. So, therefore, if someone was sucking it’s cock and it *did not* retaliate, what’s saying it doesn’t like it? A horse has the ability to kill you, so if it doesn’t do so and just stands there calm instead, I feel like it wants you to suck it’s cock. I’ve had horses turn and try to bite me while I’m brushing their necks so it’s not like it’s common for a horse to just chill out when it’s being bothered.
Dogs on the other hand are a different story. Dog have the ability to kill us but a lot of dogs are really docile. Even if their owner is doing something bad to them they won’t retaliate. I trim my dogs nails and she absolutely hates it, but she never bites or squirms away, she just looks off into another direction sadly. I can imagine a dog doing that in an unfortunate sexual situation if they really love their owner. It’s 100% taking advantage of them.
I haven’t thought about any other animals in regards to this, I don’t really think about animal sex that much. I guess you’d follow the will it kill you/will it not kill you rule. Also I’m not condoning animal sex itself because it’s depraved, but it’s just food for thought. Kinda wanted to get this thought off my chest, ya know?