I have a doggie door and both my dogs (Red Heeler and Border-collie/rottie mix) just waltz outside whenever they need to relieve themselves. Not sure where the

I have a doggie door and both my dogs (Red Heeler and Border-collie/rottie mix) just waltz outside whenever they need to relieve themselves. Not sure where the necessary intervention is other than putting the door in… and it’s certainly far more sanitary than a box of urine and feces sitting inside my house.