When using tea tree oil always use it in diluted form for the treatment cuts, burns, stings, and fungal infections. Tea tree can now be found in shampoos and coat sprays. It is safe to use on dogs and cats for various problems. Peppermint is very useful to prevent motion sickness and nausea, and very effective in discouraging insects. It smells cool and refreshing.
Lavender has a beautiful aroma and is very useful medicinally.
It is extremely useful as a fungicide and germicide. It can be applied directly to the skin, incorporated into sprays and shampoos, and is wonderful diluted in distilled water and alcohol for use as a room freshener. To calm down nervous or hyperactive dogs, place a few drops on the dog's crate pad or papers. Also, rub a little on the footpads. Personally, I have used Lavender for my dog's separation anxiety and it worked for awhile.