Preparing a horse for the death of his companion UPDATE: He's gone
For the last 4 years my older horse (now 26) has lived with a fellow senior citizen (now probably 30+). While my guy is as ornery, fat, and cantankerous as ever (routinely makes jail breaks and the like), his companion is not do well. They spent the summer on beautiful pasture, but the older one did not thrive as he normally would. He is losing teeth and just isn't thriving. While he is still in good spirits, my mom (their primary caregiver) is fearing the old man is about at the end of his time. Things are being done to help him eat and hopefully put some pounds back on, but he is OLD.
When the sad time comes, I will bring my guy back down here with me (either keeping him on the farm I manage or finding him somewhere else nearby). However, my biggest concern is the lag time between the old guy passing (whether it is assisted or natural) and me getting him down here. He has no other companions. They are the Odd Couple (truly are, too. Very unalike, but absolutely best buds).
I have suggested my mom ask around about finding a pony, donkey, or goat to join the Odd Couple so Neigh (my guy) has another companion if his pal crosses the bridge and I am a day or two away from getting him. Is there anything else we can do to prepare him for the passing of his friend? He's a good, brave, smart boy, but I worry about him being lonely and heartbroken.