I mildly toiled with it as a teen (not so much by choice, but it wasnt all that bad)

My GF tied me up one evening (well a few times, but this specific evening...) & her German Sheppard was in the room. She took peanut butter & smothered it on my cock & then summoned her dog over. Sure enough she started lapping it up like it was a snack. She let her dog do this to me for a goon hour or so & except for a couple times where she got too much of a chomp & made me flinch it was fun. The way the animal did things is so different from the way a human would & it gave it a different feel & different pleasure.

I am sure the OP is talking more of a fucking etc. angle.

I have those fantasies too, but usually watching some chick get it from an animal. For instance, this girl who lives across from my house. She has w pit bulls. Every morning before school she takes them for a walk down near the river. I always have a fantasy that I will for once go down there by chance & find the dogs being aggressive to her & as I sit back & watch, they overpower her & aggressively rip & tear her clothes apart, then shortly after one of them starts fucking her, while the other one is biting at her tits.

This girl is such a little freeze, it would give me just as much pleasure to see her dogs violate her as it would for me to do her myself. Just the humiliation she would feel would be worth not being able to devirginize her myself.