This is a hard post to write. There comes a time that a loving, dignified death free of fear may be the best option for your beloved horse. This is NOT transportation in a crowded truck to a death plant with the sounds and scents of a thousand terrified horses. However, euthanasia can provide one of the solutions for slaughter.
It was a surprise to discover that the meaning of Euthanasia is from the Greek εὐθανασία meaning "good death": εὖ, eu (well or good) + θάνατος, thanatos (death) refers to the practice of ending a life in a manner that relieves pain and suffering (from Wikipedia). Could there be such a thing as a "good death"? When might the carefully thought out, intentional ending of life be an act of mercy? How could choosing death ever be a preferred option for our dear horses? Let me volunteer my sweet Lyra as an actual horse who may someday be a candidate for euthanasia.