It's really a good thing for people to think about this. I hate it when I go on Craigslist and see old horses "free to a good home for retirement" because their owner doesn't want to deal with a horse dying. You should care for your horse until their dying day, even though it may be sad.
It is just a suggestion, in your will, outline who is to care for the animal/animals until their end of time has come, if it is not a natural passing, decide how it is to be done. Also will enough money to that person/persons to adequately support the animals to their end of life. Disposal can be determined by the new caretakers or also explained in the will. Your animals, no matter what kind, are your family too. The 'humans' may get a twing when the animals get more money than they do but .... oh well.
im only going to put my horse down if its impossible to save him, i would never put my horse down becaouse he was an incureble bucking problame like other people do!!! that kills me!!!
It is good that there is helpful information available. I had to deal with this issue this past summer. My dearly loved old quarter horse Bojack had to be put down. I'd raised him from the day he was born April 18, 1979. He was 31 years old. I lost him on Sept. 16, 2010. He was in great shape most of his life. He began to fail in early Sept. He had worked his way down to the bottom of a very steep ravine in the pasture. The horses had never gone there before. I believe he knew the end was near and had separated himself from the herd for this final act. I called the vet and my good friends to help me, but when he tried to climb the bank, he collapsed and the vet put him down as I cried and told him how sorry I was and how much I loved him. Having him for over 31 years was like losing a member of the family. There is no easy way to deal with this kind of situation, but I will try to have written instructions for the care of my other horses and pets should I die before them. They are worthy of respected end of life decisions.