You should never use pure essential oils directly on your pet (don’t apply it to their skin and don’t feed it to them), but it’s completely safe to use an aroma diffuser around them.
However, you should know that animals have a different sense of smell than we do. Cats hate the scent of citrus, cinnamon and tea tree. If you should choose to use these oils in your house, make sure your cat has the opportunity to leave the room on its own accord. The oils are not damaging or dangerous for cats, but they simply don’t like the smell.
As the owner of your pet, you should be able to tell if your pet dislikes a certain scent by looking at this behavior and body language. Please respect your pet and don’t use a certain oil they don’t like when they’re in the room. By using essential oils in the correct way, it can benefit your pet as well as you.