I agree with the above poster. I would, sadly, put the mare with cancer, and the blind one down. The blind horse is just not adapting well, and is suffering because of it. Read up on blind horses, and you will see that there are some that just cannot adapt to it- there may also be ideas you can try if you decide not to put her down. Putting down an animal, that is terminally ill, or in constant pain is never a bad thing. It means you care enough to end their suffering. Horse's don't think of pain like we do. All they know is that they hurt, and its an awful feeling to be in pain without knowing when it will end. I compliment you on your caring towards your horses, and know that you will make the right choice, which ever you choose.
You may want to get your diet analyzed to ensure your horses are getting the proper amount of nutrients. A few minor things being off can greatly affect the overall health of the animal. You could get a horse nutritionist to help, or could do some research yourself. I educated myself on horse nutrition, and after analyzing my horse's diet, found him to be deficient in quite abit of minerals and vitamins. I thought I had been feeding them the best possible, but that wasn't the case. Sometimes its very hard to figure out a proper diet, and other times its no problem. My guess is that you have a few hard keepers. I'm sure that with a bit of research and math, you can find something that will work for your babies and pack on a few pounds. I think its great that you are here. It shows that you really care about the well being of your horses, and that's the best thing someone can have!
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