I had a moron who had someone else bury a horse in a dam to a pond once and the rain started washing the dirt off. The horse was his 13 year old daughters and she loved it dearly. I asked them one day what that awful smell was and she told me. I offered to bury it right for them with my backhoe. I dug a grave, then went to the dam to dig out the remains to carry over to the grave. The horse was like soup, and it was the most awful smell I have every smelled. If I ever had to do it again, I would wear full scuba gear with my own air tank.