One Topeka veterinary clinic is warning its customers about incidents of rat poisoning, and another clinic confirmed it has seen at least three cases, including one death.

A sign taped to a counter Monday at Potwin Pet Clinic, 526 S.W. Washburn Ave., stated: "FYI: It has been brought to our attention that there have been several cases on the SE side of town of dogs ingesting rat poison that has been thrown into the yard. A white van has been seen throwing white bags into the yards and so far 15 dogs have died from ingesting the poison. Inspect your yards carefully and DO NOT leave your dogs outside at night."

Staff members said they were made aware of the incidents from other veterinarians and clinics, including Animal Care Center of Topeka.

Animal Care Center of Topeka, 2061 S.E. California Ave., recently has treated three or four cases and has seen one death because of rat poisoning, staff members said Monday. One pet owner mentioned seeing a white van in the neighborhood throwing food items into yards.

Other veterinarians and clinics have called Animal Care Center to inquire about the incidents, the clinic said.

Linda Halford, the Topeka Police Department’s animal control manager, said she had received an email a few days ago that there had been 21 cases reported at a clinic at S.E. 21st and California. So, Halford called to inquire. She learned it was three cases — one animal had died and two survived.

"I probably called at least another half dozen or more (vet clinics) and asked if they had had any cases," Halford said. "They said they had not. Things get a little confused when they get passed from person to person."

However, Halford said it is a good idea for veterinarians and clinics to be on the lookout for animals suffering from rat poisoning. It also is important for pet owners to pay close attention to their pets.