The main purpose of this legislation, known as the Preventing Animal Abuse and Waste Act (PAAW Act), is to protect dogs and cats from research that causes them significant pain or distress. It aims to ensure that the National Institutes of Health (NIH) does not engage in or fund any studies that would harm these animals. The key provision of this law is a clear prohibition on the NIH conducting or supporting any research that inflicts significant pain or distress on dogs and cats.