Trent Williams has been slapped with a demand letter to get rid of his 9 pit bull mastiffs after his neighbor's dog was mauled and killed last week ... TMZ Sports has learned.
The NFL star's Missouri City, TX neighbor is threatening a lawsuit after her 3-year-old black lab was dragged through her backyard fence and ripped to shreds on Wednesday.
Authorities are currently investigating the dog's death -- as well as the circumstances surrounding the incident -- and Linda Flowers' attorney says they're hell-bent on getting justice.