We used to leave the door open for our new aussie mux,tinker,but we bought a doggy door. we bought one with the opening about 6" from the ground so that when the tortoises are out walking around,they wont escape. This is why.
https://www.youtube.com/watch?v=zYfPTWXo0t8&feature=youtube_gdata_player
He will sit there and wait for me to open the door so he can go out to his outdoor enclosure
https://www.youtube.com/watch?v=zYfPTWXo0t8&feature=youtube_gdata_player
He will sit there and wait for me to open the door so he can go out to his outdoor enclosure