This is what I use: It is good for dogs, horses & people too!
Flea & Tick Bug Repellant Recipe
Ingredients:
1 cup Avon Skin So Soft (Original Oil)
2 cups white vinegar
1-3 cups water
1 Tablespoon Eucalyptus or Citronella oil (available at most health food stores).
Mix and Apply: Combine Ingredients and put in trigger spray bottle.
Shake well before each use.
*Spray a light mist over your dog - a little goes a long way.
Avoid nose and eyes
The weaker mixture (3 cups of water) works with flies and mosquitoes. The strongest mix (1 cup of water) is for when your dog is in tick-infested areas. However, it is not guaranteed to prevent ticks. Be sure you take other precautions, and check your dog thoroughly when you get home.
* I prefer to spray the mixture into my hands, and then rub it to the entire coat of my puppy.