As Slithern noted, kill shelters for cats and dogs are no where near what would be needed for something similar for horses.
Also, as disgusting and horrible as it is, not all euthanized pets are cremated. There has been a lot of evidence stacking up (including an EPA document) that cheap pet food companies have bought 'animal by-products' from animal shelters to use in their pet food.
Something else from the FDA
Yeah, fun stuff.![]()