I had 10 popular dark chocolate brands independently tested for heavy metals (arsenic, lead, cadmium, and mercury), and healthy cocoa flavanols.
Select a Chocolate Bakers Chocolate Cocoa Powder Dark Chocolate Milk Chocolate Semi-Sweet Chocolate White Chocolate.This is because the darker chocolate is more toxic, so a smaller amount would still result in toxicity.
Toxic Dosage. Toxicity Level In Dogs By Type of Chocolate. Common Chocolate Sources Dogs Need to Avoid.The dog had accidentally ingested approximately 250 grams of dark chocolate (approximately 135 mg/kg of theobromine).

Such details provide a deeper understanding and appreciation for Severity Of Dark Chocolate Toxicity By Weight.
Chocolate Amount Ounces of dark chocolate consumed. Weight Body weight of the animal in kilograms. 200 Milligram of theobromine per ounce of dark chocolate (average).
This means dark and cooking chocolate are extra-dangerous. Toxicity is also related to the amount of chocolate eaten relative to the weight of your dog. Be aware that smaller amounts of chocolate may still cause a gastric upset.

Chocolate Toxicity. There are many opportunities for your dog to get into chocolates around holidays such as Valentine's and Halloween. Chocolate is toxic due to both its caffeine and theobromine content. The darker the chocolate, the more caffeine and theobromine it contains.
Consumption of 85% cocoa dark chocolate improves mood in association...