A string of reported dog poisonings has prompted the Snohomish County Parks and Recreation department to issue a warning report to dog owners.

Last Thanksgiving, a dog died after likely being poisoned at Willis Tucker Park east of Mill Creek, the report said.

Two other dogs were poisoned in private yards in Marysville, and another in a yard at Lake Stevens.

According to the report, Park Rangers investigated these reports, as well as additional poisoning claims made on social media.

Veterinarians at the Animal Hospital at Murphy’s Corner in Mill Creek saw three sick dogs come in after recently visiting the off-leash portion of Willis Tucker Park. All of these dogs were reported to have foaming white gums, the report said.

No other reports of poisoned dogs have been released by the Parks and Recreation Department, but there have been additional dog poisoning claims made on social media.

The release asks residents to report suspicious activity to the department or law enforcement.

Poisoning an animal is a gross misdemeanor under Washington State law, however if it causes substantial pain, physical injury or kills the animal with undue suffering with an indifference to life, poisoning an animal may be considered first-degree animal cruelty, which is a class C felony.

Symptoms of poisoning in dogs may include lack of appetite, excessive drooling, rapid heartbeat, coughing up blood, decreased urination, bad breath, jaundice, black stool, vomiting tremors, seizures, diarrhea, paralysis and impaired movement, according to the report.

Snohomish County Off Leash Dog Parks include Willis Tucker County Park, Tambark Creek Park, Cavelero County Park and Lake Stickney County Park.