Yelp CEO Jeremy Stoppelman is really looking to make a difference this week.

Not only did he write an open letter to Arizona Governor Jan Brewer urging her to veto SB 1062, which would have allowed businesses to discriminate against gay people (eventually she did veto it), but he is also contributing to a $25,000 reward for information that would help catch the person who has been leaving poisoned meatballs for pets in San Francisco.

The Animal Legal Defense Fund writes (via NBC Bay Area):

Poisoned meatballs have been found in San Francisco again! The Animal Legal Defense Fund, SFDOG, and Yelp CEO Jeremy Stoppelman are offering a $25,000 reward for information leading to the arrest and conviction of the perpetrator(s) of the poisoned meatballs in the Bay Area. On February 22, a San Francisco animal control officer found 35 meatballs that would be deadly to unsuspecting dogs and cats who came for a nibble. The poisoned meatballs were scattered through a Twin Peaks neighborhood where a similar incident occurred last year, hidden in carports, stairwells, along curbs, and in bushes. Along with funds from ALDF and SFDOG, Yelp CEO Jeremy Stoppelman has generously pledged the bulk of the reward—contributing $23,000—to help track down the perpetrator(s) responsible.

Last year, at least two dogs were killed by very similar meatballs, and the culprit was never caught. Animal Care and Control says there’s a “high probability” the same person or people are responsible for the latest wave of meatballs.

Stoppelman is an apparent dog lover. In addition to his reddit AMA proof picture (seen at top), he posed with his dog for a couple shots for a San Francisco Chronicle profile of him in 2012.

Images via Jeremy Stoppelman, Twitter, Animal Legal Defense Fund