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Can Dogs Die from Fleas? Vet-Reviewed Facts & Prevention Tips

Written by: Nicole Cosgrove

Last Updated on May 1, 2024 by Dogster Team


Can Dogs Die from Fleas? Vet-Reviewed Facts & Prevention Tips


Dr. Luqman Javed Photo


Dr. Luqman Javed

Veterinarian, DVM

The information is current and up-to-date in accordance with the latest veterinarian research.

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One of the most common health issues that dogs can experience is a flea infestation. While these tiny pests may seem harmless, they can cause a range of health problems for your pet. One question that many pet owners ask is whether dogs can die from fleas.

While it is rare for a dog to die directly from flea bites, these pests can cause serious health issues that can be life-threatening. In this article, we’ll explore the dangers of fleas for dogs and what you can do to protect your dog from these pesky parasites.

How Fleas Can Harm Your Dog

Fleas are tiny, laterally compressed (flat), wingless insects that feed on the blood of animals. Though fleas are generally associated with a specific host species, fleas aren’t host specific. Instead, they are host preferential. This means that different species of fleas prefer certain species of animals as hosts, however they will readily feed on other hosts if the opportunity presents itself.
The dog flea is known as Ctenocephalides canis, however, interestingly, most dogs are often infested by Ctenocephalides felis (the cat flea).

When a flea bites your dog, it injects saliva into the skin. A flea’s bite is not itchy in a strict sense. Their saliva contains a range of substances that often cause an allergic reaction in your pet, known as flea allergy dermatitis. The most common signs of flea bites include itching, scratching, restlessness, self-bites, and redness of the skin. Running a hand through your dog’s fur may reveal “salt and pepper” granules in the fur. These are the eggs (white, “salt”) and feces (black or brown, “pepper”) of the fleas.

Flea populations are usually comprised of: 50% eggs, 35% larvae, 10% pupae, and 5% adults.

Dog fleas up close
Image Credit: photowind, Shutterstock

Because flea adults constitute the smallest portion of a population, can hide in your pet’s fur, are difficult to see, and are quick to jump away when noticed, even a single flea sighting is considered an infestation and a problem that needs to be addressed by your veterinarian.

In severe cases, fleas can even cause anemia, which occurs when the number of red blood cells in the body drops to a level below normal.

Flea infestations can also lead to other health problems in dogs. When a dog ingests fleas while grooming, it can develop tapeworms, which can cause weight loss, diarrhea, and other digestive issues. Fleas can also transmit diseases like Lyme disease to both dogs and humans.

It’s important to note that flea infestations can affect dogs of all ages and breeds. Even if your dog doesn’t spend a lot of time outside, it can still be at risk of flea infestations. Fleas can hitch a ride on clothing, shoes, and other items and be brought into your home.

Other Health Risks Associated With Flea Infestations

Flea infestations can also lead to other health problems in dogs. For example, flea allergy dermatitis can even cause secondary skin infections, which can be painful and require antibiotics to treat. They can also transmit diseases like Bartonella. In parts of the US, fleas have been implicated as vectors for the plague.

On top of all of that, flea infestations can be stressful for dogs and lead to behavioral problems like anxiety and aggression. It’s important to address flea infestations promptly to prevent these issues from occurring.

dog scratching ear
Image Credit: TamaraLSanchez, Shutterstock

A Bit About the Flea Life Cycle

To understand how to prevent and treat flea infestations, it helps to get some insight on the flea life cycle. Adult fleas produce eggs within 48 hours of a blood meal on your dog. The eggs take anywhere from 2 days to 2 weeks to hatch (depending on factors like the ambient temperature and humidity) in larvae.

The larvae take anywhere from a week to several months to mature into pupae. Finally, the pupae mature to adults in 5-14 days. The entire life cycle can be completed in as little as 3 weeks, but may take as long as 2 years.

As mentioned earlier, the majority of a flea population isn’t their adults but rather their eggs and other life stage forms. In addition, it should be noted that fleas can live for several months without a host, which means that even if your dog is treated for fleas, there may still be flea eggs, larvae, and pupae in your home. This is why flea treatment and prevention protocols should be implemented simultaneously.

Signs of Flea Infestations

The most obvious sign of a flea infestation is seeing fleas on your dog’s skin or fur. However, not all dogs will show visible signs of flea infestations. Some dogs may be allergic to flea saliva and develop the aforementioned flea allergy dermatitis. This can cause intense itching and scratching, which can lead to skin infections.

Other signs of flea infestations include:
  • Persistent scratching or biting (particularly near the rump)
  • Redness, swelling, or scabs on the skin
  • Hair loss or bald patches
  • Dark, gritty flea droppings on the skin or in your dog’s bedding
  • Restlessness or irritability
  • Lethargy (in extreme cases)
  • Gastrointestinal issues (if tapeworm infections are also present)

If you notice any of these signs, it’s important to take your dog to the vet for a diagnosis and treatment plan.

dog scratching in bed
Image Credit: Zivica Kerkez

Flea Treatment and Prevention Tips

Flea treatment and prevention protocols usually go hand in hand. Meaningful control over a flea problem cannot be achieved until both of these are implemented.

Flea Medication

One of the most effective ways to prevent and treat fleas is to use flea medication. These medications come in various forms such as topical solutions, pills, and collars. They work by killing fleas and preventing their eggs from hatching (by insect growth regulators), thus breaking the flea life cycle.

It is recommended to consult with your vet to determine which medication is most suitable for your dog based on their age, weight, and overall health status.

Applying flea drops to a dog with gloves
Image credit: Anastasiya Tsiasemnikava, Shutterstock

Regular Grooming

Regular grooming is also an essential part of flea treatment and prevention. Regularly brushing your dog’s coat will help you detect any signs of fleas. You’ll also want to look for what’s called “flea dirt”. These are small, black-colored specks on your dog’s skin, which is actually dried blood from flea bites. So, if you notice any signs of fleas or flea dirt, you should take action immediately and prevent a full-blown infestation, which will take more effort to treat.

Flea Comb

Flea combs are another useful tool for treating dog fleas. Flea combs have fine teeth (which are typically metal) that are designed to remove adult fleas and their eggs from your dog’s coat. Flea combs are also useful for removing fleas from your dog’s fur. When using a flea comb, it’s important to comb your dog’s entire body thoroughly, paying close attention to areas where fleas like to hide, such as behind the ears and on their rump.

g brushing the fur with fleas with a comb
Image By: thka, Shutterstock

Keep a Clean House

Keeping your home and yard clean is another important step in flea control. Fleas thrive in warm and humid environments, so regular vacuuming of carpets, rugs, and upholstery can help remove any fleas or eggs that may be present. Always wash your dog’s bedding regularly and clean all areas where they spend time, including furniture and car seats. Also, keep your lawn trimmed short to reduce flea habitat.

Give Them a Bath

Another tip for flea treatment and prevention is to regularly bathe your dog with flea shampoo. Flea shampoos contain ingredients that kill fleas on contact and can also help soothe any itching or irritation caused by flea bites. However, it’s best to follow the instructions on the shampoo carefully and not use it too frequently as it can dry out your dog’s skin.

Best Ways to Treat Flea Infections on Dogs

Having fleas can be one of the most uncomfortable conditions for your dog and they can cause serious issues if not treated effectively and regularly. Here are some of the most common methods used by dog owners and recommended by vets to treat fleas.

Anti-flea Medication

One of the most popular and effective methods for treating dog fleas is by using flea medication. Flea medication comes in various forms such as spot treatments, oral tablets, and collars. Spot treatments are applied directly to the skin of your dog’s neck or back, while oral tablets are given orally. Collars are worn around your dog’s neck and release chemicals that repel fleas. These medications work by killing the adult fleas and preventing the development of flea eggs. You can get this medication directly at your vet’s office during a visit, or they can give you a prescription.

Anti-flea Shampoos

Another effective method for treating dog fleas is by using flea shampoos. Flea shampoos contain pesticides (most commonly fipronil, pyrethrins, and permethrin) that kill fleas on contact. They can also help to soothe your dog’s skin and coat, providing relief from itching and irritation. These shampoos are easy to use and can be incorporated into your regular grooming routine. However, they may not be as effective as other treatments, and you may need to use them more frequently. But be sure to read the instructions in respect to frequency and dilution. Never use flea shampoo intended for dogs on cats, or vice versa.

Asian woman dog owner are bathing furry dogs
Image By: MT.PHOTOSTOCK, Shutterstock

Flea Comb

Flea combs are another useful tool for treating dog fleas. Flea combs have fine teeth (which are typically metal) that are designed to remove adult fleas and their eggs from your dog’s coat. Flea combs are also useful for detecting fleas before they become a problem. When using a flea comb, it’s important to comb your dog’s entire body thoroughly, paying close attention to areas where fleas like to hide, such as behind the ears and on the belly.

Can My Dog Give Fleas to My Cat?


Please be aware that some dog flea products on the market are based on compounds called Pyrethrins, these are highly toxic to cats. Please take special precautions, use only cat-specific anti-flea products on your cat and follow the manufacturer’s instructions carefully. The site, dosage, and frequency of application should never be exceeded. If you have a multiple-cat household it is recommended to keep your cats separate to avoid ingestion of toxic chemicals via allogrooming. Always consult with your veterinarian before applying any treatment to your cat. Do not allow your pets to swim in lakes or the oceans after the pyrethrin treatment application. Never use a pyrethrin-based product in the same room you keep a fish tank. Use gloves and keep away from children. Kindly dispose of the bottles considering safety precautions.

Yes, dogs can give fleas to cats. Unfortunately, fleas can easily spread from one animal to another through contact or sharing of bedding. Dogs can carry fleas in their fur, and if they come into close contact with cats, the fleas can jump onto the cat’s fur. Once on the cat, fleas can quickly multiply and cause discomfort to both the cat and the owner. So be sure to regularly check both dogs and cats for fleas and treat them appropriately with flea preventative measures, such as flea collars, topical treatments, or oral medications.

black and white cat scratching itself
Image By: Opel_pw, Shutterstock



Flea infestations are a serious threat to your dog’s health and well-being. While it’s rare for dogs to die directly from flea infestations, fleas can cause a range of health problems that can be fatal if left untreated. As a responsible pet owner, it’s important to take flea infestations seriously and try to prevent them as much as possible. If your pup should happen to get fleas, be sure to respond immediately by asking your vet for recommendations on the best treatment and prevention methods.

Featured Image Credit: February_Love, Shutterstock

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