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\"Another person, their dog was limping and she put the paw up and there was a tack, not all the way in, but it was in the paw,\" dog owner Kathy Long told KGO.

Police said animals aren't the only ones in danger, as the thumbtacks could be harmful to children as well, since they're small enough to swallow.

\"A child is very quick with that kind of thing and could have it in his mouth and swallow it before any parent could reach them,\" said Connie Van Putten, public information officer for the Hercules Police Department.

Police are asking the public to report any suspicious activity in the area.

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