First of all It's Sodium pentobarbital, not phenobarbitol. Phenobarbitol is a seizure medication. Secondly, shelters DO Not sell it's euthanised animals to pet food companies. Any animals euthanised with sodium pentobarbital can not be consumed period! This is regulated by the USDA and the FDA. Pets would be dieing left and right if they were consuming animals that were put down with sodium pentobarbital. If it were safe to consume than we would not have slaughter houses. If pet food companies were purchasing dead animals from shelters than numerous federal laws would be broken and millions of household would be dead. As a certifed Vet. tech and former shelter employee, your pets are not eating dead dogs and cats from shelters no matter how cheap the food is!