The woman told police she was walking her dog near downtown Des Plaines Tuesday when she found a hot dog with a bluish-green tint in it. She took it to her vet, who told her it was rat poisoning.
Mel Dziedzic, who works at Riser Animal Hospital in Skokie, posted a photo of the hot dogs on Facebook to warn others about the incident.
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It's not clear how long the hot dogs had been there or who had put them there.
Police said there have been no reports of any sick pets.