Eucalyptus, citrus fruits such as oranges or limes, and Borax can be used to deter fleas. Vinegar can also repel fleas when added to a pet's drinking water.
To remove fleas from inside the home, sprinkle Borax into corners and along baseboards. The Borax should also be sprinkled into cracks and crevices. Wash pet bedding in hot water and 1/2 cup of Borax. Dry the bedding on the highest heat possible to repel fleas. Sprinkle Borax directly onto carpets, and allow the powder to sit for up to 36 hours before vacuuming to remove eggs and larvae. Repeat the Borax application annually.
Fresh eucalyptus can be placed in vases around the home to repel fleas. If fresh eucalyptus isn't available, add 1/4 teaspoon of eucalyptus essential oil to 8 ounces of water in a spray bottle, and use the mixture as a repelling air freshener.
Citrus fruits are an alternative to eucalyptus. Use 1/4 cup of freshly squeezed citrus juice in a gallon of water for regular cleaning, or add the juice of one orange to a gallon of water, and use the mixture to rinse the pet's fur. If pets are exposed to fleas outside the home, add 1 teaspoon of white vinegar to a quart of cold water and allow the animal to drink the mixture to repel fleas.