Mostly male canine experience, but I have fisted a cow and got to touch and smell a horse dick in a risky situation. Would love to be with a cow again and to try and please a mare or stallion.
My preferred animal partners would be:
Foxes, I would let a fox do anything to me. My ultimate dream is to have a vixen in heat sit on my face after she is fucked by a boar.
That said, pigs, The gel plug and unique penis are such a turn on. Add to that they cum so much and hump for so long and I want to lay on a breeding bench and let a group of horny hogs fuck me for hours.
Dogs are obvious, male and female. And I would happily clean my mess out of a canine pussy or lick the smegma from a dog's sheath.
Most any barnyard animal is hot, horses, donkeys, cows, goats, and the more exotic like ostrich, llama, and alpaca. I can only imagine laying down for a big horny ostrich to either manage to get it in or just blast me with bird cum. And as for the llama and alpaca, the have a tentacle for a dick and just lay on top while their dick probes around for a warm place to dribble cum into. Oh, and they last for a while.
I would also love to be a dolphin's lover. Male or female is fine, I just want to be accepted by him/her and it to be a quick but romantic session.
Though, to be honest, if I were in the ocean and a giant whale swam up, I would have to jump in. Male or female I don't care. I would swim to the genital slit and pray that I am allowed to touch it. Ultimate goal would be to somehow slide inside for a moment or longer with an air tank. I want to be unbirthed for a moment or to get pushed back out by a giant whale dick.
Oh, and a really weird one is that I want a huge male snake to try and breed with me. Like the entire ritual of him rubbing his chin along my body until I submit to him and then he can put his dicks wherever. But both inside wouldn't be something I would disagree with. It would probably hurt depending on the species of snake though. Some of their dicks are so barbed up that a tiger would feel like a lubed up polished steel dildo by comparison.
Oh, and speaking of scary dicks I want inside me, the fossa is one other that I almost forgot about. That cute dick cuddler has two knots and barbs all over. Plus their dicks are almost as big as they are. But seriously, for those that didn't know, Fossa actually snuggle with their own cock sometimes while they sleep. It is the most adorably sexy thing I have ever seen.