Alpacas are small animals that cannot protect themselves from a horse.. They can't kick hard, they can't bite and they can't outrun a horse. I have seen far too many alpacas be seriously hurt from a horse (broken leg from kicks, broken necks from panicking trying to get away from being chase and large bites), in fact I have buried 6, and rehabbed 5 of them. Unless you have a very quiet, gentle horse, I find most horses will bully a llama or alpaca and I will not sell either to be a companion. I wean my mare way back when with alpacas, and she did well because she was very submissive. But I never had a foal or horse since then that was willing to give them the respect that they deserved.