You love your pets, but getting up at 6 AM to let Fido or Tabby out to do their personal business can certainly tax your patience. You could provide an indoor potty patch or litter tray, but that comes with the need to clean behind your pet. The perfect solution is an exterior door with a built-in pet door so that your furry darling can let him or herself out and back in again. Need to keep your baby inside sometimes? Most exterior pet doors have a secure locking mechanism to help you keep it in control.