Veterinary Dermatology

Ehrlichiosis Skin Manifestations in Dogs: Tick-Borne Disease Warning Signs

Based on peer reviewed veterinary research · For educational purposes only · Updated October 2026 · 9 min read

Chlorhexidine Shampoo

Chlorhexidine Shampoo uses 2% chlorhexidine gluconate with ketoconazole to help manage secondary bacterial and yeast skin infections in dogs recovering from systemic illness.

View Chlorhexidine Shampoo

Key Takeaways

Canine ehrlichiosis is a tick-borne bacterial infection, most often caused by Ehrlichia canis and spread by the brown dog tick.
The most characteristic skin signs are petechiae and ecchymoses (pinpoint and patchy bruising) caused by a low platelet count.
Experimental work shows infected ticks can transmit E. canis within as little as 3 hours of attachment (Fourie et al., 2013).
The ACVIM consensus treatment is doxycycline 10 mg/kg once daily for 28 days (Neer et al., 2002).
Topical care addresses secondary skin infection only; it never replaces antibiotic treatment of the ehrlichial infection.

Products for this topic

Chlorhexidine Spray

Antiseptic chlorhexidine spray for localized bacterial skin problems, scabs, hot spots and minor wounds.

View Chlorhexidine Spray

Chlorhexidine Shampoo

Medicated chlorhexidine shampoo for widespread bacterial skin problems and recurring pyoderma.

View Chlorhexidine Shampoo

What Is Ehrlichiosis and How Does It Affect a Dog's Skin?

Canine ehrlichiosis is a tick-borne infection caused by Ehrlichia bacteria that invade white blood cells, and its skin signs are mostly the result of bleeding and blood vessel inflammation rather than infection of the skin itself. The most important species, Ehrlichia canis, causes canine monocytic ehrlichiosis and is transmitted by the brown dog tick, Rhipicephalus sanguineus. A second species, Ehrlichia ewingii, is spread by the lone star tick and more often causes joint disease.

The organism lives inside monocytes (a type of white blood cell) and triggers immune-mediated destruction and reduced production of platelets, the cells that plug small vessel leaks. When platelet numbers fall, tiny capillaries in the skin and mucous membranes bleed, producing the classic petechiae (pinpoint red or purple dots) and ecchymoses (larger bruise-like patches).

In a national serologic survey of nearly one million dogs, Bowman and colleagues (2009) found E. canis antibodies in 0.8% of dogs tested across the United States, with markedly higher rates in southern states where the brown dog tick thrives year round. Because the brown dog tick can complete its life cycle indoors, kennels and multi-dog homes can sustain infections well outside typical tick season.

What Causes the Skin Signs of Ehrlichiosis?

Three mechanisms explain most of the skin changes seen with ehrlichiosis.

Thrombocytopenia (low platelet count). This is the hallmark laboratory abnormality. Harrus and Waner (2011) describe thrombocytopenia as the most common hematological finding in canine monocytic ehrlichiosis, present in the majority of naturally infected dogs. Low platelets produce petechiae on the belly, inner thighs, gums, and ear flaps, along with nosebleeds (epistaxis) and blood in the urine or stool.

Vasculitis (blood vessel inflammation). Immune complexes deposit in vessel walls, making them leaky. The result can be edema (fluid swelling) of the limbs, scrotum, or prepuce, and in some dogs areas of skin necrosis on the ear tips. Our guide to Vasculitis in Dogs explains this process in more detail.

Immune suppression and chronic illness. In the chronic phase, bone marrow suppression reduces all blood cell lines. Dogs lose weight, their coat becomes dull and thin, and they become more susceptible to secondary bacterial skin infections (pyoderma), particularly from Staphylococcus pseudintermedius. Anemia adds pale gums and slow wound healing, covered in our article on Anemia and Skin Changes in Dogs.

The disease progresses through three phases: an acute phase lasting roughly 1 to 4 weeks, a subclinical phase that can last months to years with few outward signs, and in some dogs a severe chronic phase. German Shepherds are reported to develop more severe chronic disease than many other breeds.

How Do Veterinarians Diagnose Ehrlichiosis?

Diagnosis combines history, examination, bloodwork, and specific tests for the organism.

History and examination. Tick exposure, travel to endemic regions, and kennel stays raise suspicion. Your veterinarian will check the gums, belly, ear flaps, and inner thighs for petechiae, palpate lymph nodes and the spleen, and examine the eyes, since ehrlichiosis can cause retinal hemorrhage and uveitis.

Complete blood count. A low platelet count is the most useful screening finding. Anemia and low white cell counts point toward chronic disease.

Serology. In-clinic antibody tests, such as combined tick-borne disease panels, detect exposure within minutes. Indirect immunofluorescent antibody (IFA) titers quantify the response. Because antibodies can persist after treatment, a positive result must be interpreted alongside clinical signs.

PCR testing. Polymerase chain reaction detects organism DNA in blood and is especially helpful early in infection, before antibodies develop, and for confirming clearance after treatment.

Skin signs from ehrlichiosis can look like bruising, allergic rashes, or other tick-related reactions. Our Dog Skin Condition Checker can help you describe what you are seeing, but any unexplained bruising warrants prompt bloodwork.

Signs and Symptoms to Watch For

The skin and systemic signs shift as the disease progresses. The table below summarizes what owners and veterinarians typically see in each phase.

Phase	Timing	Skin and Coat Signs	Systemic Signs
Acute	1 to 4 weeks after tick bite	Petechiae on belly and gums, limb or scrotal edema	Fever, lethargy, poor appetite, enlarged lymph nodes, nosebleeds
Subclinical	Months to years	Often none; occasional mild bruising	Few outward signs; mild low platelet count on bloodwork
Chronic	Variable, in a subset of dogs	Ecchymoses, dull thin coat, pale skin, recurrent pyoderma, slow wound healing	Weight loss, anemia, bleeding, bone marrow suppression, eye disease

A useful at-home check is gentle pressure on a red spot. A petechia does not blanch (fade) when pressed, because the color comes from blood outside the vessel, while simple inflammatory redness usually does. Look closely at the belly, inner ear flaps, and the gums above the teeth. If you recently removed a tick, compare what you see with our guide to Tick Bite Reactions on Dog Skin.

Treatment Options for Ehrlichiosis Skin Manifestations

Ehrlichiosis is treated systemically. The ACVIM consensus statement (Neer et al., 2002) recommends doxycycline at 10 mg/kg once daily for 28 days, and Mylonakis and colleagues (2019) confirm doxycycline remains the treatment of choice. Most dogs in the acute phase show clinical improvement within 24 to 48 hours, and platelet counts typically rise over the following one to two weeks. Our article on Doxycycline for Dog Skin Conditions covers dosing and side effects. Severely affected dogs may need blood transfusions, fluids, and, in some immune-mediated cases, short-term corticosteroids.

As the platelet count recovers, petechiae and ecchymoses fade on their own over one to three weeks. Edema resolves as vasculitis settles. The coat recovers more slowly, often over one or more hair growth cycles.

Secondary skin infection needs separate attention. Chronically ill or immunosuppressed dogs frequently develop superficial bacterial pyoderma, with papules, pustules, epidermal collarettes (ring-shaped scales), and odor. Topical antiseptic therapy is recommended by international guidelines as an effective way to manage superficial pyoderma and reduce reliance on additional systemic antibiotics. Chlorhexidine Shampoo contains chlorhexidine gluconate, which binds to and disrupts the cell membranes of Staphylococcus bacteria, together with ketoconazole to address concurrent yeast. It is an FDA-registered OTC veterinary drug listed on DailyMed. It supports skin recovery; it does not treat the ehrlichial infection. See our Bacterial Skin Infections in Dogs page for more on recognizing pyoderma.

Handle a thrombocytopenic dog gently. Use lukewarm water, avoid vigorous scrubbing, and ask your veterinarian before bathing if your dog is actively bleeding or has a very low platelet count.

How Can You Prevent Ehrlichiosis in Dogs?

There is no approved vaccine for canine ehrlichiosis, so prevention depends on stopping tick bites.

Use a veterinary tick preventive year round. Fourie and colleagues (2013) demonstrated that infected brown dog ticks can transmit E. canis within as little as 3 hours of attachment, far faster than many owners assume. Products that repel or kill ticks quickly offer the best protection. Ask your veterinarian which option suits your region.

Check your dog daily. Run your hands over the ears, neck, armpits, groin, and between the toes after outdoor activity. Remove ticks promptly with fine-tipped tweezers or a tick hook, grasping close to the skin.

Treat the environment. Brown dog ticks can infest homes and kennels. If you find multiple ticks indoors, speak with a pest control professional familiar with Rhipicephalus infestations.

Screen high-risk dogs. Annual tick-borne disease testing is sensible in endemic regions, for rescue and imported dogs, and for working or hunting dogs. Early detection during the subclinical phase allows treatment before chronic disease develops.

Support the skin barrier. Regular bathing and coat checks help you spot ticks, bruising, and early pyoderma, and keep the skin in the best position to recover if infection does occur.

3 hours

is how quickly an infected brown dog tick can transmit Ehrlichia canis after attaching, in experimental studies (Fourie et al., 2013)

When to See Your Veterinarian

✓Pinpoint red or purple spots on the belly, gums, or ear flaps that do not fade when pressed
✓Unexplained bruising or nosebleeds
✓Swelling of the legs, scrotum, or prepuce
✓Fever, lethargy, or loss of appetite within a month of a tick bite
✓Recurrent skin infections in a dog with known tick exposure
✓Weight loss, pale gums, or a dull, thinning coat

⚠️ Important: Unexplained bruising or pinpoint bleeding in the skin is a sign of a possible platelet problem and should be treated as urgent. Do not give aspirin or other NSAIDs to a dog with suspected ehrlichiosis, as they can worsen bleeding.

Chlorhexidine Shampoo

Chlorhexidine Shampoo uses 2% chlorhexidine gluconate with ketoconazole to help manage secondary bacterial and yeast skin infections in dogs recovering from systemic illness.

View Chlorhexidine Shampoo

Not sure what's affecting your dog's skin?

Use our free Dog Skin Condition Checker to identify symptoms, compare conditions, and learn when to see a vet.

Try the Skin Condition Checker

Frequently Asked Questions

What does ehrlichiosis look like on a dog's skin?

The most typical sign is petechiae, pinpoint red or purple dots on the belly, gums, and ear flaps, along with bruise-like patches called ecchymoses. These result from a low platelet count and do not fade when pressed.

How long after a tick bite do ehrlichiosis symptoms appear?

Acute signs usually develop 1 to 4 weeks after infection. Some dogs then enter a subclinical phase lasting months to years before chronic disease appears.

How is ehrlichiosis treated in dogs?

The ACVIM consensus recommends doxycycline at 10 mg/kg once daily for 28 days. Most dogs improve clinically within 24 to 48 hours, and skin bruising fades as platelet counts recover.

Can ehrlichiosis cause skin infections in dogs?

Indirectly, yes. Chronic ehrlichiosis suppresses the immune system and bone marrow, making secondary bacterial pyoderma more likely. These infections are managed alongside antibiotic treatment of the ehrlichiosis.

Sources

Neer TM, Breitschwerdt EB, Greene RT, Lappin MR. Consensus statement on ehrlichial disease of small animals from the infectious disease study group of the ACVIM. Journal of Veterinary Internal Medicine. 2002;16(3):309-315.
Harrus S, Waner T. Diagnosis of canine monocytotropic ehrlichiosis (Ehrlichia canis): an overview. The Veterinary Journal. 2011;187(3):292-296.
Bowman D, Little SE, Lorentzen L, et al. Prevalence and geographic distribution of Dirofilaria immitis, Borrelia burgdorferi, Ehrlichia canis, and Anaplasma phagocytophilum in dogs in the United States: results of a national clinic-based serologic survey. Veterinary Parasitology. 2009;160(1-2):138-148.
Fourie JJ, Stanneck D, Luus HG, et al. Transmission of Ehrlichia canis by Rhipicephalus sanguineus ticks feeding on dogs and on artificial membranes. Veterinary Parasitology. 2013;197(3-4):595-603.
Mylonakis ME, Harrus S, Breitschwerdt EB. An update on the treatment of canine monocytic ehrlichiosis (Ehrlichia canis). The Veterinary Journal. 2019;246:45-53.
Hillier A, Lloyd DH, Weese JS, et al. Guidelines for the diagnosis and antimicrobial therapy of canine superficial bacterial folliculitis. Veterinary Dermatology. 2014;25(3):163-175.