Equine Breeding?
zephania666
He'll manage just fine.
Ocimom
He should be able to cover her. I would have an experienced vet or breeder with the horse in case you need to help him manually.
Zzz
If you have to ask questions you shouldn't be breeding any thing.
Judy and the Beast
If the stallion is old or arthritic he may have trouble. I had a 14.2 mare covered by a 13.2 stud and he needed to stand on the top of a hill with her on the lower side to get the job done.
Eva
Very difficult but it can be done, They will need to dig a hole for her to stand in or have a ramp for him.
john
Hah hah a 10 hand stud can climb on her if she lets him!
oikoσ
Let the stallion decide. If he is hesitant, you might have to put him up to it. ;-) It's sort of like the astronaut who landed on a planet and was met by a gorgeous woman who was nine feet tall. His first words were, "Take me to your ladder; I'll see your leader later."
Dawn
No body allows there stallions to live cover any more.