COUNCIL BLUFFS, Iowa (AP) — Authorities are investigating the latest of what residents in one western Iowa neighborhood believe is a series of dog poisonings dating back years.

Several dogs have died mysteriously along Rosebud Lane just outside Council Bluffs in the last six years.

The latest being investigated by the Pottawattamie County Sheriff’s Office is that of a golden retriever puppy belonging to the father of Tara Campbell of Council Bluffs. A trip to Campbell’s eastern Nebraska veterinarian after it became six Tuesday showed the dog had anti-freeze crystals in its urine. The dog later died.

Sheriff’s investigators are testing refried beans found in the yard where the puppy had been tethered.

Campbell says she has had two other dogs die suddenly in the last six years.