I sell a "Puppy-Mint" dogie shampoo bar. Researching the topic, led me to a 1:1:1:1 ratio of Lavender, Tea Tree, Atlas Cedar, and Peppermint. I used .5 oz ppo.
I just yesterday picked up a account at the groomer we use. At the Saturday farmers market, we have repeat customers giving us testimonials about the flee killing and the skin repair from the Tea Tree.
That is the best 4 EO's I've researched. Works well for us anyway. :wink:
Just be sure to post a warning that using the soap on felines could cause severe reactions even death.
Paul :wink: