I've got three, Tango is my horse, Chick and Heidie are our ponies, and they've got two, Stellar their pony and Chester their horse (Chester isn't here yet).
We introduced Stellar to the horses (Chick and Stellar are both POA, did the same circuit, I think they know one another, personally, they're very friendly and both seem to trace back to the same place), the girls were more or less fine but Tango is being a bit of a bum, he's been chasing her around since yesterday, getting the girls into it- it's very chaotic at the moment. (What I'm worried about is the two new horses have all 4 shoes, and according to the kid "stellar is VERY fragile, she NEEDS all 4 all the time" maybe she does, but I don't want anybody getting hurt).
If I got my way, we'd have two extra paddocks (but no, we need a place to keep the chickens ) and the field would be split down the middle, but we can't right now SO! What do you guys think? Should we let them battle it out? Chester comes tomorrow, no idea what will happen then, it's been suggested to just keep him in the paddock but I don't agree, they all need turnout and that's a VERY difficult rotation, I think they'll establish their 'pecking order' and it'll be fine, but everybody around here sees it differently.