25% cacao chocolate bar (like milk chocolate) would be only 25% as toxic as the same dose of baker's chocolate. One ounce of milk chocolate per pound of body weight is a potentially lethal dose in dogs. Wildlife In 2014, four American black bears were found dead at a bait site in New Hampshire. A necropsy and toxicology report performed at the University of New Hampshire in 2015 confirmed they died of heart failure caused by theobromine after they consumed of chocolate and doughnuts placed at the site as bait. A similar incident killed a black bear cub in Michigan in 2011. Pest control In previous research, the USDA investigated the possible use of theobromine as a toxicant to control coyotes preying on livestock. See also Xanthine oxidase Footnotes References (September 9, 2004) Merck Veterinary Manual (Toxicology/Food Hazards section), Merck & Co., Inc., Chocolate Poisoning. (June 16, 2005) External links Toxicity basic facts Cat health Dog health Poisoning by drugs, medicaments and biological substances Veterinary toxicology