Select a nylon heavy-duty collar for your dog in the correct size. Nylon and other fabric types will absorb the mixture. You can use this as your dog's every day collar as well.

Chose one of the following essential oils which repel fleas: rosemary, rose geranium or citronella. Be sure to use only 100% pure essential oils.

Use one drop of the essential oil of your choice on the collar each week. You can use up to two drops, but as some dogs are more sensitive to oils than others, start using one drop only until you gauge your pet's reaction.

If you are using for ticks as well, rose geranium is the best choice.

Cat flea collars: If you are making a flea collar for a cat, do not use citronella, only use rose geranium or rosemary.