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Shannon likes being in the backyard, I have to keep a careful eye on her because she always finds some spot in the fence to crawl through and ends up snooping in the neighbour's yard, but she returns when I call her. She's pretty good at coming when called, well sometimes I need to repeat myself but overall coming when called is not too bad. Small dogs such as chihuahuas shouldn't be left alone in the backyard, even if it's fenced in. Depending on where you live, they can become easy prey for birds such as hawks, and even a cat could pose a danger for a chihuahua.