The first step toward proper dog health is often to treat similar nail issues with anti-fungals, since the condition can be confused with a fungus infection. If this form of treatment is ineffective, Symmetrical Lupoid Onychodystrophy is the more likely diagnosis. In that case, supplemental fish oils and vitamin E added to your dog's diet can eventually get SLO under control. Direct application of either oil directly on the affected nails may help as well. Proper wound care is essential, if appropriate, and long-term care is often needed in the form of the supplementary oils. Food allergies are a possible trigger for the immune disease, so a change of dog food may be in order.