Young Living Essential Oils. Source: http://www.youngliving.com/en_AU/essential-and-massage-oils

This remedy is taken from “Essential Oils Desk Reference (fifth edition)” published by Life Science Publishing for Young Living Essential Oils.

Antifungal Skin Recipe (Essential oils):
– 10 drops of patchouli;
– 4 drops of niaouli (Melaleuca quinquenervia);
– 2 drops melaleuca (M. alternifolia)
-5 drops lemongrass

Application and Usage:
– Apply 2-4 drops of oil diluted 50/50(with V6 oil) on location 3-5 times daily.

Also, I would add boost your pet’s immune system with lots of fresh meat and vegetables (organic if possible) or any pet health supplements. Make sure your pet always have plenty of fresh, filtered water for drinking.