Working horses, pet horses and wild horses all die, and usually not from old age. It would be safest to outlaw any horses existing all. Then none would die. Everything that lives will die, including you. That's no reason to deny living things their chance at a life.
“Everything that lives will die, including you”
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That’s mean. Who are you to say that people die. You are a hateful, racist person. s/off.
You should research the Nurse Mare Foals atrocities.
Nurse Mares have to constantly be bred to produce the thorough bred foals. It has to be live insemination, no AI. The fowls are torn from the mothers after birth, so the mares can be shipped to stud farm to breed again.
The foals are often slaughtered in favor of the more expensive prospective prize winner foals.