Poison meatball warning for San Francisco pet owners

About 50 meatballs containing the poison strychnine have been found around the city, making pet owners and dog-walkers nervous.

It's unclear why the meatballs are being left.

So far, the poison has killed two feral cats, a skunk, and a raccoon. No dogs have died from eating the meatballs, although at least one is in critical condition.

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