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Fleas are a nuisance. These tiny, blood-sucking parasites irritate your dog and infest your home — often before you realize they’ve moved in. Many dogs are allergic to flea bites, which can cause intense itching, red and flaky skin, scabs, hot spots, and hair loss. Fleas can also cause tapeworm and anemia.
“Preventing fleas is much easier than dealing with an infestation,” says Dr. Max Jones, DVM at Bahama Road Veterinary Hospital in Bahama, North Carolina. “Environmental treatment may be required, especially in established or severe infestations. I celebrate all forms of life, but bloodsucking, itch-inducing, disease-carrying parasites are not welcome on my dogs.”
Preventing fleas and the problems they cause requires a multipronged approach. It first involves understanding some basic things about their life cycle, vet-approved treatments, and when to consult a professional.
Why Is Flea Prevention So Important?
Fleas are more than pesky parasites; they can also carry and spread disease.
“In addition to skin issues, fleas are required in the transmission of the dog tapeworm, Dipylidium caninum,” says Dr. Jones. “For this common parasite, a dog can only become infected by eating an infected flea, typically through grooming itself. It cannot be passed between dogs in the absence of fleas. Reinfection after treatment is common if fleas are not also addressed.”
Fleas can also spread viral and bacterial infections, including Bartonella and murine typhus, and life-threatening anemia, especially in very young puppies. Dogs can also be allergic to fleas. Here, a dog would have an excessive itch reaction.
“I tend to think that every dog is allergic to flea saliva to varying degrees, and that there is a spectrum of sensitivity rather than ‘normal’ versus ‘flea-allergic dogs,'” says Dr. Jones. For this reason, a dog can have as bad an itch reaction from just one flea bite as a dog that has many fleas, since the scratch-itch cycle is brought on by the allergy to the flea saliva rather than the flea.
In addition to excessive itching, signs of an allergic reaction to fleas would include hair loss, scaly skin, and secondary skin infections.
Understanding the Flea’s Life Cycle
Knowing your enemy is the first step to defeating them. The same applies to fleas. Measuring just a few millimeters, these tiny bloodsuckers can leap 150 times their body length (6-and-a-half inches). A single female can lay up to 2,000 eggs during her lifetime, and they can hatch within one to 12 days.
Fleas go through four life cycle stages:
- Egg: Once laid, your dog can shed eggs on your carpet, furniture, or any place they make contact with
- Larva: White and maggot-like, flea larvae burrow into your dog’s coat and feed on your dog’s blood and “flea dirt,” which is digested blood from adult fleas
- Pupa: The larvae form cocoons that only hatch in the proper conditions; they can remain dormant for up to a year
- Adult: From the cocoon emerges the fully grown flea, ready to continue the cycle of sucking your dog’s blood and endlessly reproducing
You can eliminate fleas at any stage of their life cycle. However, this goes beyond eliminating them from your dog; it involves removing all eggs, larvae, cocoons, and adults from your home entirely.
Symptoms of Fleas
The most common symptoms dog owners associate with fleas are excessive scratching, licking, and chewing. Yet, the signs of an infestation can be more nuanced.
“A closer inspection may reveal fleas or flea dirt, which is digested blood (flea feces) and appears as black specks in the hair coat,” explains Dr. Jones. “Any area of the body can be affected, but fleas often seem to prefer the back half of the dog, with problems commonly seen around the base of the tail, rear legs, and groin.”
In more severe cases, a dog can develop hair loss, skin rashes, wounds, or scabs, along with secondary bacterial skin infections. Every dog breed, whether double-coated or hairless, benefits from flea preventatives. Still, even fleas have preferences when selecting a host.
“Some dogs will be a more hospitable environment for fleas than others,” says Dr. Jones. “The biggest factor seems to be the hair coat; long or thick hair coats provide more hiding areas for fleas.”
Treatment of Fleas
The best option for treating a dog with fleas depends on their unique health profile, and your veterinarian will account for many factors when creating a treatment plan. There are topical, injectable, and oral medications available.
“While there are many options, the isoxazoline class of drugs is currently the most widely recommended flea and tick prevention for dogs,” says Dr. Jones. “This includes brand names such as NexGard, Bravecto, Simparica, and Credelio.”
While the U.S. Food & Drug Administration (FDA) considers the isoxazoline class of drugs to be both safe and effective for dogs, it shares the potential for neurological side effects.
“Care should be taken in dogs with a history of neurological disease, such as seizures or tremors,” says Dr. Jones. “Your veterinarian can discuss options to help you find what’s right for you and your dog.”
Never use flea treatment medications intended for dogs on cats or other pets. Always read the instructions and informational labels on flea preventatives, and reach out to your veterinarian with any questions.
Removing Fleas From Your Home
Treating your dog for fleas is just one piece of the larger flea eradication puzzle. You must also take special care to eliminate any eggs, larvae, pupae, or adults that have taken residence in your home. You must be thorough, and above all, patient. It’s not uncommon for fleas to seemingly disappear, only for pupae to hatch months later and trigger a new infestation.
To completely eradicate fleas from your home:
- Wash all dog beds, plush toys, and blankets in hot, soapy water. You may need to wash these items more frequently until the infestation has officially cleared.
- Vacuum everything, including rugs, tiled floors, linoleum, and upholstered furniture. Dispose of the vacuum’s contents in a bag outdoors.
- Apply a flea defogger or control spray to eliminate all fleas at every life cycle stage
- Discourage fleas and ticks from inhabiting your yard by keeping the grass short
If your dog travels in your car, you should also vacuum the seats to remove any hair or debris. Be sure to keep them on a regular preventative schedule and limit their interactions with dogs who may have fleas — especially during flea season when temperatures increase.
Prevention of Fleas
There are many flea preventatives, each with its own benefits and special considerations. Dr. Jones notes that the regular, year-round use of modern flea prevention medications is generally safe, effective, and poses minimal risk. Still, owners may wonder whether there are any natural ways to shield their pet from fleas.
“Various natural products are touted to help prevent fleas, including apple cider vinegar, essential oils, coconut oil, or even diatomaceous earth,” says Dr. Jones. “While these treatments can play a role in flea prevention, efficacy and safety have often not been evaluated, so these treatments should be discussed with your veterinarian prior to use.”
Always consult your veterinarian before using any over-the-counter or at-home flea remedies, and be particularly cautious when using essential oils to prevent fleas on your dog. Essential oils are potent, highly concentrated liquids that can cause skin irritation, gastrointestinal upset, and even liver damage if ingested.
It’s never too late to start your dog on a flea preventative plan. Your veterinarian will consider your dog’s age, sensitivity to medications, and allergies when promoting their health. They can also advise you on the latest technologies in flea preventative science and other ways to keep them safe.
This article is intended solely as general guidance, and does not constitute health or other professional advice. Individual situations and applicable laws vary by jurisdiction, and you are encouraged to obtain appropriate advice from qualified professionals in the applicable jurisdictions. We make no representations or warranties concerning any course of action taken by any person following or otherwise using the information offered or provided in this article, including any such information associated with and provided in connection with third-party products, and we will not be liable for any direct, indirect, consequential, special, exemplary or other damages that may result, including but not limited to economic loss, injury, illness or death.