Was an animal or human sprayed?
Did it just happen?
This is what we do for skunk spray:
Mix 1 quart 3% Hydrogen Peroxide,
1/4 cup Baking Soda ,
1 teaspoon liquid soap,
Take this mixture (Cover the dog's eyes) and massage well into the coat let sit for about about 20 mins. and then rinse. This should get the smell out.
Repeat if necessary. Please let me know if you need further help.