Here's a breakdown:
* Horse meat is not a significant ingredient in most dog food. The primary protein sources for dog food are typically chicken, beef, and lamb. While horse meat is used occasionally, it's not a major component.
* Many horses are euthanized for medical reasons. Horses can develop severe health issues that require euthanasia. This is a common reason for their death, not specifically for dog food.
* Some horses are slaughtered for human consumption. This is primarily a practice in some European countries and is controversial. It's important to note that the slaughter of horses for human consumption is regulated in many countries.
* The use of horse meat in pet food is generally a byproduct. When horses are euthanized or slaughtered, their bodies are often processed, and the meat can be used in pet food if it meets safety standards.
It's important to be aware of the different reasons why horses are euthanized or slaughtered, and to understand that it's not primarily for dog food. The practice of using horse meat in pet food is complex and often misunderstood.