Sulfur For Dogs. You should dilute the sulfur with water, to make more effective and less harmful to dog’s skin. Large quantities of sulfur in drinking water can contribute to diarrhea, which leads to dehydration.

You should dilute the sulfur with water, to make more effective and less harmful to dog’s skin. Sulfur on dogs the best way to use sulfur as flea control is to incorporate small amounts of it into the dogs diet, which gives the dog’s skin a distinct scent that fleas and other parasites avoid. Dogs can be fed the same amount every three days, but larger dogs can be