They might be taking them to a landfill. Our area no longer has a rendering plant nearby, so big animals that can't be buried on the property have to go to the animal pit at the landfill. Might seem a little yucky, but I feel once the animal is dead it is just a body. That being said, I paid the vet to dispose of the body as I did not want the last visual memory of my mare being her body dumped in the landfill, and I KNOW that is what would have stuck with me! I said my goodbyes and went in the house!