Goats make good pasture mates for horses. We have 3 pygmy goats (they have their horns) They are always out with the horses in the turnout area. One of the goats has buddied up with one of the geldings. They eat together, play together, she washes him. He will push her with his nose and she will rear up and act like she is going to butt him and they will do this for hours. Then she washes his legs as far up as she can reach. Also Our mare has a new foal at her side does not like any of the other horses around but doesn't mind that the goats are around. The foal is even begining to play with the goats. She loves to chase them around.

The other reason goats make good buddies is that they graze the same way horse do on a pasture, so they won't ruin it.. Unlike sheep who rip out the grass from the roots, cattle are just hard on everything in general. Mini horses and donkey's also make good buddies but require the same up keep as regular size horses. I don't really feed my goat special food, I throw out a little extra hay for each (1/2 flake or so for the 3 of them) but they are easy keepers and are good weed eaters (well some days, mine are a little picky only like certain weeds).

Hope this helps.