Original sentence: The amount of pentobarbital in dog food has caused dogs to become less responsive to the drug when being euthanized, though a 2002 FDA study found no dog or cat DNA in the foods they tested
Edited sentence: The amount of phentobarbital in dog food has caused dogs to become less responsive to the drug when being euthanized, though a 2002 FDA study found no dog or cat DNA in the foods they tested