Essential oil blends used in dog shampoo can help relieve skin conditions, as well as help protect against fleas and ticks. The following recipes all call for the essential oils to be added to eight ounces of an all-natural shampoo base.

Skin Soothing Shampoo for Dogs with Itchy Skin and Allergies
2 drops Geranium
6 drops Rosewood
6 drops Lavender
1 drop Roman Chamomile
2 drops Carrot Seed
1 tablespoon of finely ground oatmeal can be blended in to provide further relief.

Healing Shampoo: For Dogs with Skin Infections and Small Wounds
(such as minor scrapes, nicks, and insect bites)
4 drops Ravensare
2 drops Labdanum
1 drop Helichrysum
3 drops Lavender

Flea and Insect Repellent Shampoo
4 drops Clary Sage
2 drops Citronella
8 drops Peppermint
4 drops Lemon

Tick Repelling Shampoo
2 drops Geranium
2 drops Rosewood
3 drops Lavender
2 drops Myrhh
2 drops Opoponax
1 drop Bay Leaf