Flea Allergy In Bulldogs And French Bulldogs

By: Dr. Roy Kraemer |
DVM, Bulldog Specialist Veterinarian

Flea allergy is one of the most common skin allergies in many geographic regions.

Flea Four-Part Cycle:

The flea life cycle consists of four stages, but many pet owners are only aware of the adult flea stage, which lives on their pet’s skin and coat.


Adult fleas constitute only 5% of the flea cycle, and they are the sole stage that feeds on blood, causing the itching and irritation experienced. Despite being the smallest percentage of the cycle, their rapid reproduction can lead to significant problems if left unchecked.

Addressing adult fleas is crucial for effective flea control and preventing associated issues

Fleas and Allergies in Bulldog and French Bulldog Puppies


The eggs represent 50% of the cycle. A flea can deposit eggs in clusters of 20–40 directly on the host’s fur. However, these eggs can dislodge and settle in the surrounding environment.

Egg hatching takes place within a span of 1–10 days; this timeline can be influenced by variables such as temperature and humidity.

Understanding this aspect of the flea life cycle is crucial for effective prevention and control measures.


The larvae represent 35% of the cycle. Flea larvae are blind, worm-like creatures that primarily feed on organic debris, including flea dirt (dried blood droppings from adult fleas).

These larvae avoid light and prefer residing in dark, humid areas such as carpets, furniture, and bedding. Throughout their development, larvae undergo two moltings, shedding their skin before progressing to the next stage. Following this phase, they spin a protective cocoon, entering the pupal stage, which lasts for 5-20 days. Understanding the behavior and lifecycle of flea larvae is vital for effective flea control


Adult cocoons constitute 10% of the flea cycle. The pupa serves as a protective cocoon in which the larva transforms into an adult flea.

Pupae can remain dormant for extended periods, ranging from weeks to even months. They emerge from dormancy when they sense vibrations or warmth, signaling the presence of a potential host in the vicinity.

This awareness of the pupae to environmental cues is a crucial aspect of the flea life cycle and factors into effective control strategies.

Flea Allergy in Bulldogs CLIMATE SENSITIVITY:

In colder areas, diagnoses often peak during the summer months. Conversely, in warmer regions, bulldogs may experience persistent itching due to flea allergies throughout the entire year.

The flea cycle climate sensitivity underscores the importance of understanding regional factors in managing and addressing these common skin allergies in bulldogs.

The onset and prevalence of flea allergies are influenced by temperature variations

The ideal temperature for flea development is around 70-85°F (21-29°C) with 70% humidity.

Flea Allergy In Bulldogs / MAIN CAUSE:

Bulldogs with flea allergies exhibit heightened sensitivity to the saliva injected during a flea’s blood meal bite.


Sometimes, even a single bite can trigger prolonged itching that persists for days.

A hypertensive bulldog could suffer from intense itching despite a low flea count.

French Bulldog Itchy Flea Allergy

Flea Allergy In Bulldog and French Bulldogs PRESENTATION

Allergic bulldogs commonly experience an intense itch, prominently observed at the top of their back, particularly around their tail base.

  • ITCH: intense itch
  • HAIR LOSS: dorsal lumbar and tail base
  • DISCOLORATION: redness and discoloration
  • SECONDARY INFECTION: infections are secondary to the injured skin barrier associated with the itching

Bulldog Flea Allergy DIAGNOSIS

Detecting fleas involves recognizing both the insects and their characteristic black pepper-like excrement, known as flea dirt. This residue is a byproduct of digested blood.

To facilitate flea detection, employing a flea comb, particularly in the suspected dorsal lumbar area, can be highly effective. Fleas are commonly visible on the hind legs and in the hairless section of the belly.

Regular checks in these areas are essential for promptly identifying and addressing flea infestations.

Flea Allergy in Bulldogs and French Bulldogs PREVENTION

Approximately 95% of the flea cycle is not on your pet but in your environment. Therefore, it is crucial to use a preventive product with a residual effect.

Without a residual effect, there’s a risk of reinfestation shortly after; therefore, you must use preventive measures that provide extended coverage


There is a wide range of oral and topical flea preventatives, most of which last for 30 days. Bravecto can last for up to three months.

Some of them also provide additional protection (all in one), such as

  • Tick prevention
  • Demodex mite prevention
  • Heartworm prevention
  • Intestinal parasite preventives

Here is a short list of some of the popular one

  1. NexGard
  2. Bravecto
  3. Simparica
  4. Revolution


You can also treat your yard and house in a more severe case in addition to the monthly preventive to help eliminate flea eggs and larvae.

  • Regularly vacuuming upholstery and bedding
  • Washing dog’s bedding
  • Treating the yard with insecticidal sprays


LIMITED IMPACT: Some popular and, at times, hyped products have limited to no impact and are not recommended as stand-alone preventives; most of their claims have no clinical study proof and are anecdotal at best.

Here is a short list:

  • Flea neck collar repellents
  • Herbal remedies
  • OTC garlic
  • So-called “natural,” “organic,” and “holistic” flea prevention and treatment products.
  • Essential oils

While some natural alternatives, like garlic or essential oils, are often promoted for flea control, they lack scientific evidence of effectiveness and can be highly toxic to pets if ingested or applied topically.

Remember, the safest flea prevention product for your pet is the one used correctly under the guidance of your veterinarian. They can help you choose the right product based on your pet’s age, breed, health condition, and lifestyle, minimizing the risk of potential toxicity.

Avoid using any unapproved products for flea control on your pet and stick to veterinarian-recommended solutions.


Using a flea shampoo may provide an immediate, temporary sense that the problem is resolved. However, this can be deceiving, as such products do not offer lasting protection. It’s essential to recognize the temporary nature of these solutions and implement preventive measures with a residual effect to ensure continuous and effective flea control.


Stopping flea preventives when the itching subsides is a common mistake that can lead to a rapid resurgence of the problem.

Flea allergy is chronic; consistent prevention is essential to secure your pet’s long-term health and well-being.

  • Prevent flea-born diseases
  • Prevents tapeworms
  • Stress
  • Itch 
  • Secondary skin infection: dermatitis (bacteria and yeast)
  • Discomfort
  • Anemia: in young kittens and puppies, blood loss from flea feeding can become critical

Flea Allergy in Bulldog / TREATMENT SUCCESS

The success of flea allergy treatment may hinge on several factors, including the extent of the infestation, environmental considerations, and the presence of multiple pets.

In households with more than one pet, it is crucial that all pets, especially those that spend time outdoors, are on a consistent flea prevention regimen.

This comprehensive approach is essential for effective treatment and to prevent the recurrence of flea allergies among your pets

bulldog flea allergy dermatitis

Flea Allergy in Bulldog ITCH CONTROL

While waiting for the flea preventive to take effect, managing the existing itch is crucial.

STEROIDS: Prescription anti-itch medications, such as cortisone (prednisone), prove highly effective in providing relief from itching. However, it’s important to note that these medications do not contribute to flea eradication.

Corticosteroids are commonly prescribed for acute episodes of particularly itchy FAD

Other itch-relief medications prescriptions are antihistamines and apoquel


Cortisone (prednisone) is a potent medication commonly prescribed to control itching associated with flea allergies. However, its usage should be approached with caution, as it is not considered safe for long-term use. While effective in providing relief from itching, prolonged and indiscriminate use of cortisone can pose potential health risks to your pet.

OTC RX / ANTIHISTAMINS: Many antihistamines are available over-the-counter (OTC). While they are not standalone solutions for effective or reliable itch control, they can be safely used and combined with other itch control modalities.


Non-prescription options should always be added for allergies, itching, and secondary skin infections


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Severe and uncontrolled flea allergies can frequently lead to a secondary bacterial infection. The intense itching associated with these allergies can cause damage to the bulldog’s skin barrier, creating conditions conducive to the development of secondary bacterial and yeast infections. Addressing flea allergies promptly is crucial to preventing and managing these additional complications.

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Flea Allergy in Bulldog Rule of Thumb

The flea life cycle is predominantly composed of eggs, larvae, and cocoons, with adult fleas representing only 5% of the cycle and having a brief lifespan.

To prevent reinfestation of your bulldog, it is essential to implement consistent preventive measures not only in your immediate environment but also for other pets like cats and dogs. This preventive approach should ideally be maintained throughout the entire flea season or, even better, year-round.

Providing preventives to all your pets is a crucial strategy to effectively avoid reinfestation and ensure the well-being of your furry companions.

Flea Allergy in Bulldog and French Bulldogs Tips & Warning

Flea-preventive NECK COLLAR TIP:

The repellent effect of most flea collars is weak and short-lived. Fleas can easily bypass the collar or become accustomed to the repellent over time.
Contact kill: Some collars claim to kill fleas on contact, but the concentration of insecticide in the collar is often too low to be effective.

Additionally, many fleas avoid direct contact with the collar altogether.

Bulldog Flea Allergy INFECTION WARNING:

Poorly managed flea allergies have the potential to progress to infectious and yeast dermatitis secondary to the flea allergy. Timely and effective management is essential to prevent complications and ensure the overall well-being of your bulldog.

Bulldog Flea Allergy ANEMIA WARNING:

Chronic allergies, if not effectively managed, can lead to anemia, especially in young kittens and puppies.


Intense itching can subject your bulldog to stress and pose a risk of orthopedic injuries due to frantic scratching and reaching sensitive areas.

Bulldog Flea Allergy TAPEWORM WARNING:

Adult fleas serve as carriers for tapeworms. The presence of tapeworms in your bulldog is a byproduct of fleas, transmitted when your bulldog licks its fur and swallows an infected flea.

Rice-like grain near your bulldog’s butt area is likely tapeworm segments and a clear indication that your bulldog has had fleas. Immediate veterinary attention is advised for a proper diagnosis and treatment. Early intervention is crucial to ensuring the health and well-being of your bulldog.

Vigilance in managing allergies and related risks is essential for maintaining your bulldog’s health and preventing potential complications


While some studies suggest garlic may have some flea-repellent properties, the evidence is weak and inconclusive. The dosage needed for effectiveness in dogs is unknown and could potentially be harmful.

Garlic can be toxic to dogs in high doses, causing anemia and other health problems. OTC garlic supplements often have inconsistent concentrations, making it difficult to control dosage and ensure safety.


These older insecticides were once common in flea collars and sprays but are now rarely used due to their high toxicity risk. OPs can cause severe neurological symptoms like tremors, seizures, and even death if ingested or absorbed through the skin.


Similar to OPs, carbamates are insecticides that can cause nervous system problems in pets. While not as potent as OPs, they can still be risky, especially for young animals or those with sensitive skin.


These synthetic pyrethroids are commonly found in flea and tick collars and topical treatments. While generally safe for most dogs, permethrin can be very toxic to cats, causing neurological issues and even death.

Always ensure any product containing permethrin is specifically labeled for dogs and keep it away from cats.


This newer class of insecticides is effective against fleas and ticks but has been linked to neurological side effects in some dogs, like tremors, ataxia, and seizures.
The risk is considered low for healthy dogs, but it’s crucial to discuss potential side effects with your veterinarian before using an isoxazoline product, especially for breeds known to be sensitive to medications.


  • NexGard
  • Bravecto
  • Simparica

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The information provided on this platform is for general informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your veterinarian regarding any medical condition. It's important to always consider professional medical advice promptly and not to delay seeking it based on information you've read on this platform. Any reliance on the information provided here is entirely at your discretion.

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