Skip DIY flea remedies: Homemade flea treatments, like vinegar or essential oil sprays, can be harmful or ineffective, Dr. Corrigan says. It’s always better to stick with veterinarian ...

Make your own citrus homemade flea spray by cutting up a few lemons, boiling them in water, and steeping for a few hours. To apply to the fur, either use a spray bottle or dip a comb into the liquid.