We leave our dog in the house when we go places. We don't have a doggy door, mostly because when we're not home, I don't want her outside. We have a coyote problem here plus I worry about her somehow getting out of the yard. When we are home, she does her "business" outside, but we also paper trained her, so when we're going to be gone for any length of time, we just lay down some newspaper for her to use. She is a 13 year old Italian greyhound, so she mostly sleeps all day anyway, but I still feel guilty leaving her. We get to the park at opening, but rarely stay past 6 just because I feel we should get home to the dog. I'm pathetic.