Our wax melts are made with 100% organic coconut wax and vegan-friendly, cruelty-free fragrance oils only. No nasties, glitters or unnecessary chemicals or additives. This means they are as clean as it is possible for a wax melt to be and very unlikely to trigger a reaction in common household pets. While we use a blend of essential and fragrance oils we do avoid the essential oils known to irritate pets such as cinnamon, citrus, pennyroyal, peppermint, pine, sweet birch, tea tree (melaleuca), wintergreen, and ylang ylang. So many of our customers have pets (as we do) that that we use fragrance oils in place of essential oils in blends that include these scent notes. We cannot guarantee a pet won't react if they have very specific allergies - if you are unsure we advise consulting your veterinary practice before use. To date we have not had one reported case of an incident or reaction and 70% + of our customers have pets.