They have also learned to ring the bell for when they just want to go out. Tonight's renters brought their huskies with them, and one of them got away enough to say hello to our pups. Since then, the puppies have been ringing the bell frequently just so they can go out and stare at our cabin.
The most astonishing incident with the bell happened the other morning. Janelle had let them out and back in when she woke up at 4am to get ready to go to work. She was a little irritated when Starbuck rang the bell only a few minutes after she let them in. When she opened the door, Starbuck walked away and went back to her crate indicating that she didn't want to go out. However, Ranger (one of our cats) came in from the arctic entryway. Janelle had inadvertently shut the cat in the entryway, and Starbuck used the bell to let Janelle know of the cat's plight.
Like I said, they're quick learners.