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He/She probably saw a bird.

If there was nothing in the sky when he/she started barking, and he/she is in the middle of a field with nothing surrounding it, then it could be that he/she has some problems.

If he/she is barking from your backyard then it might be there is a noise coming from the roof. It could a squirrel...

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16y ago

What else can I help you with?