Nine multi-colour, bone-shaped dog treats were found near the south entrance of Marie Curtis Park on Saturday. The park is located in the Long Branch neighbourhood, along Lake Shore Boulevard west of Brown's Line.
Police say the dog treats could be harmful, or fatal, if swallowed.
Anyone with information is asked to contact police at 416-808-2200. Tips can also be passed on anonymously through Crime Stoppers at 416-222-8477.