If you just pulled a tick off your dog, this is the disease to know about. Ehrlichiosis is a tick-borne bacterial infection that can hide quietly for weeks, then surface as fever, bruising, or nosebleeds long after the tick is gone. The good news? Caught early, it's very treatable. Caught late, it gets dangerous fast.
Key Takeaways
- Ehrlichiosis spreads through the brown dog tick (Rhipicephalus sanguineus), the most common tick in Indian homes and kennels.
- In one Punjab study, 86.9% of dogs suspected of the disease tested positive for E. canis antibodies (Ludhiana study, PMC).
- The standard cure is doxycycline for 28 days, with most dogs improving within 24 to 48 hours (Merck Veterinary Manual).
- Bleeding, pale gums, or collapse mean go to a vet immediately.
What to do right now
If you've found a tick or your dog has fever, low energy, or bruising, here's the short version. Remove any tick you find with tweezers, gripping close to the skin and pulling straight out. Note the date. Watch for fever, lethargy, loss of appetite, or any bleeding over the next three weeks. If symptoms appear, or if you're worried, get a vet to run a blood test. Ehrlichiosis is diagnosed with a simple in-clinic blood test and treated with an affordable, widely available antibiotic. Speed matters more than panic.
What is ehrlichiosis in dogs?
Ehrlichiosis is a bacterial infection caused by Ehrlichia species, most often Ehrlichia canis, which invade a dog's white blood cells after a tick bite. It is one of the most common tick-borne diseases in Indian dogs. In a study of suspected cases from Ludhiana, Punjab, 86.9% of dogs tested positive for E. canis antibodies (PMC), and a separate study in eastern India confirmed the infection circulating widely in pet dogs (PMC).
The full name for the E. canis form is canine monocytic ehrlichiosis, or CME. After the bacteria enter the bloodstream, they multiply inside immune cells and attack the body's platelets, the tiny cells that help blood clot. That's why bruising and bleeding are such telltale signs. It is closely related to other rickettsial tick-borne diseases, and a single tick can sometimes carry more than one pathogen at once.
How do dogs get ehrlichiosis?
Dogs catch ehrlichiosis from the bite of an infected brown dog tick, not from other dogs or people. The vector across most of India is Rhipicephalus sanguineus, the same brown tick you find on kennel walls, sofas, and floor cracks. In the Punjab case series, 79% of infected dogs had a history of tick infestation (PMC). The tick picks up the bacteria as a larva or nymph and passes it on at the next blood meal.
Here's why India is high-risk. The brown dog tick thrives in warm, humid conditions and breeds indoors, so it stays active almost year-round in much of the country. The monsoon and the weeks after it tend to bring a surge in tick numbers. Apartment dogs aren't safe either. These ticks live happily in homes, not just forests and fields. If one dog in a building has them, the ticks spread fast.
What are the symptoms of ehrlichiosis?
Symptoms usually appear 8 to 20 days after the bite and come in three phases: acute, subclinical, and chronic (Merck Veterinary Manual). The tricky part is the silent middle phase, when a dog looks fine but the infection is still there. Many owners miss it entirely.
Acute phase (first 1 to 4 weeks after symptoms start):
- Fever
- Low energy and weakness
- Loss of appetite
- Swollen lymph nodes
- Nosebleeds or easy bruising
- Cloudy or red eyes
Subclinical phase: The dog seems healthy. There are no outward signs, but the bacteria persist in the body, sometimes for months or years. Bloodwork may still show a low platelet count.
Chronic phase: If the infection was never cleared, it can return as severe disease, with weight loss, persistent bleeding, eye problems, joint pain, kidney trouble, or bone marrow suppression. Chronic ehrlichiosis is far harder to treat than the early stage, which is exactly why catching it early matters so much.
When is ehrlichiosis an emergency?
Treat it as urgent the moment you see bleeding or collapse. Because E. canis destroys platelets, the most dangerous complications are clotting failures. Get to a vet immediately if your dog shows any of these signs:
- Bleeding from the nose, gums, or in the stool or urine
- Widespread bruising or tiny red spots on the belly or gums
- Very pale or white gums
- Sudden weakness, wobbliness, or collapse
- Difficulty breathing
- Seizures or other neurological signs
These point to severe thrombocytopenia (a critically low platelet count) or anemia, which can be life-threatening without prompt care. Don't wait to "see if it passes." In our experience with worried dog parents, the cases that go badly are almost always the ones where bleeding signs were brushed off for a day or two.
How is ehrlichiosis diagnosed?
Vets diagnose ehrlichiosis with a blood test, often confirmed by a second one. The fastest route is a serological test such as ELISA or an indirect fluorescent antibody (IFA) test, which detects antibodies against Ehrlichia and is widely available in Indian clinics (PMC). A complete blood count usually shows the classic trio of a low platelet count, anemia, and low white cells.
For early or unclear cases, a PCR test can detect the bacteria's DNA directly, which is useful in the first days before antibodies build up. Your vet may also run a biochemistry panel to check kidney and liver function, since chronic cases can affect the organs. If you remember when you found a tick, tell your vet. That timeline genuinely helps the diagnosis.
What is the treatment for ehrlichiosis in dogs?
The standard treatment is doxycycline, and it works well. The Merck Veterinary Manual and the ACVIM consensus recommend doxycycline at 5 mg/kg every 12 hours, or 10 mg/kg once daily, for 28 days (Merck Veterinary Manual). Most dogs perk up dramatically within 24 to 48 hours of starting it. Doxycycline is inexpensive and easy to find at Indian pharmacies, but the dose must come from your vet, never guesswork.
A few things matter during treatment. Finish the full 28 days even after your dog looks normal, because stopping early invites a chronic relapse. Severe cases with heavy bleeding or anemia may need supportive care or even a blood transfusion. And because a month of antibiotics can upset the gut, many vets suggest supporting digestion during recovery; if your dog develops loose stools or throws up brown or dark liquid, mention it at the follow-up rather than waiting. Recheck bloodwork as your vet advises to confirm the platelet count has recovered.
How can you prevent ehrlichiosis?
Prevention comes down to one thing: stop ticks before they bite. There is no vaccine for ehrlichiosis, so consistent tick control is your real protection. In a year-round tick climate like India's, that means treating the dog and the environment together.
- Use a vet-approved tick preventive every month, whether a spot-on, oral chew, or collar. Don't skip the cooler months in warm regions.
- Check your dog daily for ticks, especially around the ears, neck, toes, and armpits.
- Remove ticks promptly with tweezers, pulling straight out close to the skin.
- Treat the home, not just the dog. Brown dog ticks breed indoors, so vacuum cracks, wash bedding hot, and treat kennels and sofas.
- Be extra vigilant after the monsoon, when tick numbers climb.
If you have multiple dogs and one tests positive, watch the others closely and talk to your vet about checking them too. Tick prevention also lowers the risk of related infections like leptospirosis and other parasitic diseases that share the same risk factors.
Recovery and long-term outlook
For dogs treated early, the outlook is excellent. Acute ehrlichiosis caught in the first weeks usually resolves completely with a full doxycycline course, and platelet counts climb back to normal within a few weeks. The picture is harder for chronic cases. Dogs that reach the chronic phase can carry lasting effects, such as joint pain, eye changes, kidney impairment, or bone marrow problems, and may need longer monitoring.
The single biggest factor in a good outcome is how quickly the infection is caught and treated. That's the whole reason this disease rewards a watchful owner. Keep up tick prevention even after recovery, because a dog can be reinfected by a new tick bite. Recovery from ehrlichiosis does not make a dog immune.
Summary Table
| Aspect | Details |
|---|---|
| What it is | Bacterial infection (Ehrlichia canis) of white blood cells, spread by ticks |
| Main vector in India | Brown dog tick (Rhipicephalus sanguineus), active year-round |
| Incubation | 8 to 20 days after the bite |
| Phases | Acute, subclinical (silent), chronic |
| Key symptoms | Fever, lethargy, bruising, nosebleeds, pale gums |
| Emergency signs | Bleeding, collapse, pale gums, breathing trouble |
| Diagnosis | ELISA/IFA blood test, CBC, PCR for early cases |
| Treatment | Doxycycline for 28 days; most improve in 24 to 48 hours |
| Prevention | Monthly tick preventive, daily checks, treat the home |
| Outlook | Excellent if caught early; harder if chronic |
Frequently Asked Questions
What are the first signs of ehrlichiosis in dogs?
The earliest signs are fever, low energy, loss of appetite, and sometimes swollen lymph nodes, usually appearing 8 to 20 days after a tick bite. These can be subtle and easy to miss. Any unexplained bruising or a nosebleed is a strong reason to get bloodwork done quickly.
Can ehrlichiosis in dogs be cured?
Yes. Ehrlichiosis is curable with doxycycline, typically given for 28 days, and most dogs improve within 24 to 48 hours of starting treatment (Merck Veterinary Manual). Cure is far more reliable when the disease is caught in the acute phase rather than the chronic stage.
How long can a dog live with ehrlichiosis?
A dog treated early can live a full, normal life with no lasting effects. Untreated, the infection can progress to the chronic phase and cause serious complications like bleeding disorders, kidney damage, or bone marrow failure, which shorten lifespan and are much harder to reverse.
Is ehrlichiosis contagious to other dogs or humans?
Not directly. Ehrlichiosis does not spread dog-to-dog or dog-to-human through contact. It is transmitted only by the bite of an infected tick. That said, if one dog in a home has ticks, the others share the same exposure risk and should be checked.
Can a dog get ehrlichiosis more than once?
Yes. Recovering from ehrlichiosis does not make a dog immune. A fresh bite from an infected tick can cause reinfection, which is why year-round tick prevention remains essential even after a dog has been fully treated.
Does the monsoon increase the risk of ehrlichiosis in India?
Tick numbers tend to rise during and after the monsoon, when warm, humid conditions favor the brown dog tick. Because this tick also breeds indoors, the risk in India is high across most of the year, so prevention shouldn't be limited to the rainy season.