If you've ever felt your pet could benefit from aromatherapy, you'd probably also prefer the essences were 100% organic. In that case, Tortue Rouge has got your back. They have an extensive listing of animal health complaints and recommended aromatherapeutic solutions. (Theoretically at least; I couldn't get the list to work on my browser.)
They say that most animals appreciate aromatherapy, but also warn you to never force an animal to smell something it doesn't seem to want to. If you do, they note, it probably won't benefit anyhow. (I am wondering, though, how they can have aromatherapy for pets but also say "no animal testing" on every page?)
From: BEST OF 2008: Eco-friendy and sustainable shoes