Dirty Dozen Chemicals: SLS Many people that I meet ask me to describe why I do not use certain chemicals.  I tell them that my reasons are practical not political.  I generally explain in three to five stepped reason why I do not use certain ingredients.  Most encourage me to offer my simplified reason, so I am beginning to undertake why we do not use certain ingredients.  In this series of article, I will start with the Dirty Dozen. For pets, we have to realize that perhaps the worst chemical that they come in contact…