Please explain to me why my dog barks at nothing and growls in his sleep every night?

I you live in an older house, there could be mice inside the walls. You can't hear them but your dog can. Mice also get active at night, so that's when their noise starts.

They chew on wires, make a mess, etc. And, if you are thinking about ghosts, then your mind will make you see things that aren't really there...

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Have a nice day.

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