OOH OOH, I can vouch for this Linda.
We have a doggy door the same kind and size as Travis. We have a sweet neighbor girl who is a sophomore in high school and is slightly special. She loves our dog Pudge, like he is her own (she loves all of the neighborhood dogs for that matter).
She dog walks and pet sits for us when we are on short trips. She is also legally blind (I realize how silly this is sounding).
Anyway, one time when we were gone for a week when we came home, all was well, but when I asked her for the key to our house back she admitted it had flown out of her hand in our yard and she was never able to see it, to find it!
Her family came to help her look for it but they weren't able to find it.
Poor kid, she was so nervous. When I asked her how she had gotten in and out of the house she said, "the doggy door."
I could hardly believe it. This girl is about 5'6", very nice figure but muscular and with very broad shoulders.
She still to this day will sometimes come in through our doggy door! She is friends with our children too, and its sort of a joke.