Dog won't go outside?

My family has had this dog for the better part of 4 years. She was raised by old folks, and when they passed away we got stuck with her. She was never taught proper dog manners, but she was trained to go outside, and for as long as we ve had her we ve had no problems. Recently, though, she just refuses to go... show more My family has had this dog for the better part of 4 years. She was raised by old folks, and when they passed away we got stuck with her. She was never taught proper dog manners, but she was trained to go outside, and for as long as we ve had her we ve had no problems. Recently, though, she just refuses to go outside. We will tell her, "Go outside!" And she either just stands there, or even goes into her bed like we told her to go lay down, or goes upstairs. She isn t afraid of anything outside, she just simply doesn t want to go. When we do make her go, she actually goes out and pees and poops. So why doesn t she want to go outside??? She has to relieve herself, but simply just is reluctant to go. The grass isn t too long, there aren t any scary animals or sounds, so what is the problem?
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