While 2-phenethyl propionate is a natural ingredient extracted from peanuts, another natural flea and tick repellent is juice from a lemon or orange. This is safe for dogs, as it doesn't harm pets if the juice is licked off.
Another method of natural flea and tick control is the use of lavender essential oil, which repels fleas, ticks, flies and mosquitoes. Rose geranium and cedar essential oils also have some insect-repelling qualities. Peppermint and rosemary are also popular ingredients. These essential oils can be applied directly to the dog's collar or diluted with other ingredients and sprayed on the fur. They should not be applied to skin or fur undiluted as they may cause irritation. Rinsing the dog with apple cider vinegar may also help repel fleas.
If the dog is already infested with fleas, washing the dog thoroughly with water and lemon juice can help kill the fleas, thus avoiding chemical flea baths. A flea comb coated in petroleum jelly can catch any remaining fleas. Ticks that are already on the dog need to be removed manually. Since natural repellents have varying levels of effectiveness, dogs should be checked for ticks regularly. In areas with Lyme disease, dogs should be checked daily. Supplementing the dog's diet with certain foods such as garlic and brewer's yeast may also help repel biting insects.