Some people on the canine epilepsy list have used the following formula and everyone that has tried it, says that it works really well. We have not tried it ourselves.
Combine:
1 quart 3% hydrigen peroxide
1/4 cup baking soda
1 tsp. liquid soap
Work into the coat and rinse well.
Good luck....
Rich and Coby Cobyatlake@aol.com