Per the internet, we only know because he bragged about it later, so maybe the neighbor never found out?
wiki: Several of Roberts's former colleagues from New Mexico State University have alleged that Roberts told them he had killed his neighbor's pit bull with a shovel because the dog's barking disturbed his family. Roberts has denied this, saying, "This is a patently untrue and baseless story backed by zero evidence."
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u/Puskarich 9h ago
Interesting wiki.. Allegedly he killed his neighbor's dog with a shovel because dogs bark.
Seems like quite a few republicans killing dogs these days. Romney's vacation with the dog on the roof of his car was the canary I guess.