I haven't had any problems with any of mine concerning the dog door. If it's closed, they bang on the door, or come find me. If we are somewhere without a dog door, like a hotel, they jump on the door, or hover around the door doing the "I have to go outside" dance. I've had a dog door with all three of the GSDs as puppies. I close it if it's too wet and rainy out. Or during a tornado warning.
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~ Diane in Okla
Carly ~ AKC Champion, GCh pointed, HIC
Sage ~ AKC Ch. pointed (13 pts), HIC
Russell ~ "oh that Russell...!"
Mimi & Pi ~ the meezers