Neither of my horses (Cholo+Freckles) like being separated. It makes it really hard for me to ride either of them, or even take them out. One will gallop madly around neighing and carrying for the other one. Yesterday Cholo even jumped a four foot fence and cut his leg (he's okay, but still... he could've been really hurt). I'm worried one of them is going to get really hurt and it makes it really hard to ride them. How can I get them to calmly and safely accept the fact that the other is currently occupied??