Abstract: A composition for reducing pest infestation of animals, such as domesticated animals, by topical application of the composition to the animal. The composition is effective in both reducing future infestation by acting as a pest repellent and also acting as a pesticide to aid in also reducing present infestation. The composition comprises a eucalyptus oil, present in an amount of 4% to about 22% by weight, a lower molecular weight, low carbon content alcohol, such as isopropyl alcohol which is miscible with water, present in an amount of about 9% to about 33% by weight, and water generally present in an amount of about 45% to about 85% by weight, all being based on the total fluid weight of the composition. The invention provides a method of reducing pest infestation by topically applying to an animal, on a periodic basis, a selected amount of the pest repellent composition.