From my understanding, it isn't the oils themselves that are the issue....its the things that they mix it with. Therapeutic grade oils are supposed to be safe for all pets, but many companies do not use them in things such as candles due to cost. Many use things that "dilute" the oil by mixing it with other things, if the oils are "essential" or not.
The
Scentsy website says that "Scentsy uses both synthetic and naturally derived fragrances oils to achieve the highest quality and longest lasting wax bar. "
On a another
Scentsy page: Scentsy Products are manufactured with fragrance oils. Fragrance oils can be all-natural or laboratory-reproduced copies of natural aromatic chemicals, depending on cost-effectiveness. In some cases, Scentsy Products also contain essential oils–natural oils derived from plants that can have therapeutic effects and are produced without regard to their cost-effectiveness. Scentsy Products may contain essential oils but do not necessarily contain them, so we make no claims about essential oils in our marketing. Please beware of unscrupulous marketing campaigns. “Infused with essential oil” could mean nothing more than one drop of essential oil in a very large batch. “Inspired by essential oil” means nothing more than the product contains fragrance oil.