Calcasieu Parish sheriff's deputies arrested 20-year-old Aaron D. Simoneau on Monday.
Diana Morales with the Calcasieu Animal Services Department said Simoneau used the sword to kill "Puppy," a miniature chow mix that was more than 10 years old.
She said the incident occurred while Simoneau was at an acquaintance's home.
Morales said a person convicted of aggravated cruelty to animals faces a maximum penalty of 10 years in prison and a $25,000 fine.
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