The scent and natural properties of cedarwood oil make it especially helpful in repelling fleas. When fleas come into contact with cedarwood oil, the moisture will eventually be leached off of them, causing them to die. It is a good natural way to treat a flea infestation around your home or on your pets. If you are using cedarwood oil topically, it must be very diluted.
This is extremely important if you will be applying it to your pets; always perform a patch test and check with a vet to ensure the oil is safe for use. To make a room or pet spray, add a few drops of cedarwood oil into a spray bottle full of water. You can then spray your carpet, furniture, and pets with the mixture.
To deter fleas from taking root in your home, you can diffuse several drops of cedarwood oil with distilled water in any room in your house.