Eagles and other birds of prey don't need to climb over a wall to take a shot at your dog. Bobcats can climb trees. As someone mentioned - there are snakes - most of them around here are small constrictors, not poisonous, and not hungry enough to try and swallow a dog. But there are a couple that are poisonous. There's also the matter of shade. If your yard has no shade trees, you absolutely wouldn't want to leave your pets outside unattended.
I don't let my cat outside without me right there with her, and she is skittish about being outside, which is a good thing. She's an indoor cat. If I had dogs I would never -ever- leave them anywhere outside unattended, not in my yard, not anywhere else.
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