My dog is vegetarian and the sulfurous vegetable like cauliflower, brussel sprouts and broccoli are among his their favorites yet I know broccoli is listed as one of the plants toxic to dogs. Probably a sulfur compound maybe the very ones that fight cancer in us, in addition to some others components that a dog cannot digest. This does not mean it applies to humans or in the same ratio. Humans can obviously tolerate greater than 10% Anyone care to try a broccoli fast and see now much more?