Maybe from trauma? My dog was terrified of brooms for a few months, because my grandmother hit her with it when she was here before. Of course when we found out why she was so afraid, we didn't let my grandmother do anymore cleaning while she was here, but that didn't solve my dogs fear.
What did help was slowly reintroducing her to the broom. I lay the broom on the floor and sat next to it, and told my dog to come. She was reluctant at first, but eventually she came near the broom. It took a few days for her to actually get close enough to touch it.
Then I moved the broom upright and did the same thing, telling her to come and that it was okay. She's totally fine with brooms now, although she's still a little afraid of my grandmother.
It may take a few days or weeks, but you have to keep at it, until the dog understands the object itself is not that scary.
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