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Some dogs get uncomfortable or anxious if left alone in complete darkness.

Others might have poor night vision (mine tends to bump into things / have trouble using stairs if it’s pitch-black).

Learn to know your dog, they are not things that can be left alone in a fully dark, unheated home.

My dog is noticeably more scared of things in the dark. He will bark at strangers in the dog park after sunset, which he never does during the afternoon. I don't have any smart tech for my dog, but I can understand the desire.

Inside the house been in the dark is not an issue for my dog. Outside he just doesn't feel safe as when he is inside and he needs to be sure there's no danger around him