Animal euthanasia It was proposed that the presence of pentobarbital in dog food may have caused dogs to become less responsive to the drug when being euthanized. However, a 2002 FDA study found no dog or cat DNA in the foods they tested, so it was theorized that the drug found in dog food came from euthanized cattle and horses. Furthermore, the level of the drug found in pet food was safe. Animal euthanasia Animal euthanasia (euthanasia from ; "good death") is the act of putting an animal to death or allowing it to die by withholding extreme medical measures. Reasons for
Animal model of autism Animal model of autism The development of an animal model of autism is one approach researchers use to study potential causes of autism. Given the complexity of autism and its etiology, researchers often focus only on single features of autism when using animal models. One of the more common rodent models is the Norway rat ("Rattus norvegicus"). More recent research has used the house mouse ("Mus musculus") to model autism because it is a social species. Other strains of mice used include mu opioid receptor knockout mice, as well as "Fmr1" knockout mice; the latter are also used as animal