Assemblies that allow pet access through a panel and enclosures having multiple functions. More specifically the enclosures include pet doors that allow for selective entry, whereby one or more designated animals are allowed to enter into the enclosures while other non-designated animals can be easily excluded, without owner supervision. The enclosures herein are useful for multiple purposes, non-exclusively including the isolation of pets so they can eat, eliminate waste, whelp, queen, nurse their young, or sleep without being bothered by other non-designated pets. Preferred embodiments are directed to barriers positioned near the pet door to deter other non-designated pets from interfering with the designated pets entering into the enclosures.
