Poisoned meatballs planted along sidewalks in the Twin Peaks and Diamond Heights neighborhoods of San Francisco are making dogs "severely ill," according to reports.
The meatballs appear concentrated in the area of Crestline Drive and Burnett Avenue, the San Francisco Examiner reported.
Several dogs, including one named "Oskar", ate some of the meatballs and became very ill.
Oskar is currently at Animal Internal Medicine and Specialty Services. The poison appears to be strychnine, one veterinarian told the newspaper.
At least 50 pieces of poisoned meatballs and other dog treats have been located, according to San Francisco police.
The poisoned treats are threats to children as well as dogs, animal experts say.
Police have been notified but there are no suspects at this time.