Descendants of Hemingway's original cats continue to live on the premises. In 2009, the cats became the subject of federal litigation after a museum visitor expressed concern about the cats' welfare. United States Department of Agriculture investigators visited the museum and subsequently ordered the museum to take measures to tag the cats for identification and to shelter them. The museum fought the regulations in court but lost their case in the court of appeals, which ruled that the cats "substantially affect" interstate commerce and thus are protected by the Animal Welfare Act of 1966. The house does not sell cats but does continue a selective breeding program for them.