The recent thread,
Today my horse killed another horse
Was disturbing to me. I've had little experience in my 26 years of horse ownership with dangerously aggressive horses. The one time I did, a little 14"2hh mare kicked my Arab "Corporal" (1982-2009, RIP) so hard that I thought that she'd broken his leg--she didn't, fortunately. At that point I separated her from the rest of the herd and sold her.
Even my super-tough horse, "Tyke" (1970-1998, RIP) who beat up several other horses of mine, used descretion. When he took over the herd the day after I bought him, he allowed my elderly mare and my pony to hang with him, and brought peace to the rest of the herd. As long as I took time to introduce a new horse to his herd everything was fine and no horses were hurt.
My current herd like each other. My two 5yo geldings are such BFF's that they put each other on the opposite sides of the fence to bite each other--go figure. My mare, 3/3, enjoys their company. NO worries, no Vet bills. Just little nicks and bite marks, sometimes kick marks.
It occurred to me that people new to horses know very little about judging a horse's temperment. They do what we all used to do, head first, body second, "can I ride it?" third, etc.
I'd like input from your experiences to help the newbies so that they don't bring home a monster who injures their existing horse(s), or WORSE, injures a person. I will wait to post my pointers so that I don't repeat good advice. My PURPOSE for this thread is to help. Thanks, in advance. =D