Researchers worry that toxic components in the oil could wipe out generations of some species, but there is no way to predict the effects. (scientificamerican.com)
Products that lack odor or are without known toxic components, and that can be applied directly to surfaces, are less likely to cause harm. (patrickmahaney.com)
Along with not knowing what the exact toxic component is, we also do not know exactly how many grapes or raisins are toxic to dogs. (onpets.com)