youtube is actually my main source of jerk material, and the 3ds youtube app doesn't block it, so bonus
most of these seem to be getting pulled pretty quickly and i wonder if youtube is seeing the incoming source and just sniping them, so you'll have to manually input these into your adress bar to protect them
here's some of my favorites
horse penetration closeup with male horse using condom, including graphic pullout
youtube.com/watch?v=4tr-77IiKdA
a massive fresian stallion mating an adult pony that could easily be mistaken for a foal. this is also humane btw, it's usually done by artificial insemination but horses do not bear foals larger than their uterus.
youtube.com/v/4cqDFzQCI5c
ground semen collection on a stallion. it's the closest thing you'll find to someone jerking off a horse on youtube. it's really cute how he thrusts and looks rather confused
youtube.com/watch?v=cU4RPWnZmvQ
an aggressive, hyper male stallion mating a female donkey to produce a mule
youtu.be/_14aJiAwTh4?t=2m50s
a less hyper stallion mating a donkey. it's short but nice.
youtube.com/watch?v=mDhGKLBrdgw
a medium sized stallion mating a smaller and rather reluctant mare. the size difference is nice and she eventually accepts him, but i think how eager and large he was frightened her at first. at the end he just sort of lays on her out of exhaustion and you can really notice the size difference.
youtube.com/watch?v=0xaGPA0bNns
this doesn't have a successful mating in it but the stallion is gorgeous
feral horse mating with a really nice closeup shot
youtube.com/watch?v=iccV6gLHhLE
another ground semen collection. this stallion knows what's happening and is really eager to get at it. the angle is funky, however.
youtube.com/watch?v=FzEL6NYGEQc
ground semen collection of a very tiny pony stallion. they show the load in the bag at the end, horses of any size produce a Lot
youtube.com/watch?v=2Hft9-kvEQ8
this video is blurry as all fuck but it's really good. it's a large stallion penned up with a much smaller pony. the pony doesn't resist him and actually backs her ass up into him, which is something mares in heat are well known to do. they mate more than once. i guess they sort of just put them in a small pen together to avoid the awkwardness seen in the fresian/pony vid i linked above.
youtube.com/watch?v=ifFPA5QLQgM
i could probably dig up dog videos if anyone wants. i mostly like horses but ive watched dog vids quite a few times