What Is Ehrlichia in Dogs and How Do You Treat It?

If your dog just tested positive for ehrlichia, or your vet mentioned it after finding a tick, it’s completely normal to feel worried. Ehrlichiosis is a tick-borne bacterial infection that can sound alarming, but the good news is that when it’s caught early and treated properly, most dogs recover fully.

What is ehrlichia in dogs?

Ehrlichiosis (sometimes called ehrlichia or tick fever) is a bacterial infection caused by organisms in the Ehrlichia genus. These bacteria are carried by ticks and passed into your dog’s bloodstream during a bite. Once inside, they target white blood cells, the cells your dog’s immune system relies on to fight infection.

The two species most commonly seen in dogs in the US are Ehrlichia canis, spread mainly by the brown dog tick, and Ehrlichia ewingii, spread by the lone star tick. E. canis tends to cause more severe illness and is the species most associated with serious long-term complications. German Shepherds appear to be especially vulnerable to severe forms of the disease, though any breed can be affected.

Ehrlichia is not contagious between dogs or from dogs to people through everyday contact. The only way it spreads is through the bite of an infected tick.

The three phases of ehrlichiosis in dogs

Ehrlichiosis moves through three stages, and understanding them helps explain why some dogs seem sick right away while others appear healthy even after a positive test.

Acute phase (weeks 1–3)

This is when symptoms first appear, usually one to three weeks after a tick bite. The immune system is actively fighting the infection, which is why dogs often feel noticeably unwell. Most dogs respond well to treatment started during this phase.

Subclinical phase (weeks to months)

Here’s the tricky part: after the acute phase, some dogs move into a subclinical phase where they carry the infection but show no obvious symptoms. The bacteria are still present, platelet counts (the blood cells that help clotting) may still be low, and organ damage can be quietly progressing. This is why a dog can test positive and seem completely fine.

Chronic phase

If ehrlichiosis isn’t treated, it can progress to a chronic stage, which is significantly harder to manage. At this point, the bone marrow, kidneys, eyes, and nervous system can all be affected. Chronic ehrlichia in dogs carries a much more guarded prognosis, meaning the outcome is less predictable and recovery is harder. This is why early detection and treatment matter so much.

Symptoms of ehrlichia in dogs

Symptoms vary depending on which phase your dog is in. Here’s what to look for at each stage:

Symptom	Acute Phase	Chronic Phase
Energy & behavior	Lethargy, not wanting to move or play	Significant weakness, possible neurological signs like stumbling or head tilting
Appetite & weight	Loss of appetite	Significant weight loss
Temperature	Fever (feels warm, pants more than usual)	Not typical, but systemic illness is present
Lymph nodes	Swollen (lumps under the jaw, behind the knees, or in the groin)	May remain affected
Eyes & nose	Runny eyes or nose	Eye inflammation called uveitis, which can appear as cloudiness or redness, and can lead to blindness if untreated
Skin & bleeding	Bruising or small pinpoint bleeding spots from low platelet count	Bleeding episodes, including nosebleeds
Blood health	Low platelet count	Anemia (low red blood cells), causing pale gums and weakness
Organ involvement	Not typical in early stages	Kidney problems

Early treatment during the acute phase gives your dog the best chance of a full recovery with no lasting complications. Dogs with chronic disease may face ongoing kidney issues, eye problems, or immune system effects that require long-term management.

How vets diagnose ehrlichiosis

There’s no single test that tells the whole story, so vets typically use a combination of approaches.

Blood work: A complete blood count checks white blood cell levels, red blood cell levels (to detect anemia), and platelet count. Low platelets are one of the most common findings with ehrlichia.

SNAP 4Dx test: This is an in-clinic screening test that checks for several tick-borne diseases at once, including ehrlichia, Lyme disease, and anaplasma. It’s often the first tool a vet reaches for and gives results in minutes.

IFA titer test: A blood sample sent to a lab that measures antibody levels, meaning how strongly your dog’s immune system has responded to the infection. This helps confirm exposure and gauge severity.

PCR test: A more precise test that looks for the actual DNA of the bacteria in your dog’s blood. It’s especially useful in the early acute phase or when other results are inconclusive.

Because ehrlichia and anaplasma in dogs can look very similar and sometimes occur together as co-infections, vets may test for both at the same time.

Ehrlichia in dogs: treatment

The primary treatment for ehrlichiosis is doxycycline, an antibiotic given orally for 28 to 30 days. Doxycycline works by stopping the bacteria from reproducing, giving the immune system time to clear the infection. Most dogs treated during the acute phase show improvement within a few days of starting the antibiotic.

Your vet may also recommend supportive care depending on how sick your dog is. That might include fluids if your dog is dehydrated, medications to manage inflammation, or in serious cases, a blood transfusion to address severe anemia.

A routine case with blood work, a SNAP 4Dx test, and a 28-day course of doxycycline might run a few hundred dollars. If hospitalization, additional diagnostics like a PCR test or IFA titer, or supportive care like IV fluids are needed, costs can climb into the thousands, particularly for chronic cases.

After finishing the course of doxycycline, your vet will likely recheck blood work to confirm platelet counts have returned to normal and that the infection has resolved. Don’t skip that follow-up appointment.

My dog tested positive but seems healthy: what now?

This is one of the most common and confusing situations dog owners face. Your dog just tested positive on a SNAP 4Dx at a routine wellness visit, but they’re eating, playing, and acting completely normal. What’s going on?

A positive SNAP 4Dx means your dog has been exposed to ehrlichia and their immune system mounted a response. It doesn’t automatically tell you whether the infection is active right now or whether your dog is in the subclinical phase, where the bacteria are present but symptoms haven’t shown up yet.

This is where the conversation with your vet really matters. Here are specific questions worth asking:

• Should we run a PCR test to confirm active infection? A PCR test checks for actual bacterial DNA and can distinguish between past exposure and a current active infection.
• What does my dog’s blood work show right now? Ask specifically about platelet count and white blood cell levels. Abnormal values even without symptoms may influence the decision to treat.
• Do you recommend treating now or monitoring? Some vets treat proactively with doxycycline; others prefer to monitor with follow-up blood work every few weeks. There’s no single right answer, and it depends on your dog’s individual results.
• Should we test for co-infections? Because ticks often carry more than one pathogen, it’s worth asking whether anaplasma or Lyme disease testing is warranted too.
• How often should we recheck? If you’re in a monitor-and-wait approach, get a clear timeline for follow-up blood work so nothing gets missed.

The subclinical phase can feel frustrating because there’s nothing visible to act on, but staying on top of it with regular monitoring is exactly the right move.

Does pet insurance cover ehrlichiosis?

There’s no vaccine for ehrlichiosis, which means prevention comes down to consistent tick control: veterinarian-recommended tick preventatives used year-round, checking your dog after time outdoors, and removing any attached ticks promptly and properly. Tick-borne diseases are common across much of the US, and the diagnostics alone can add up fast.

That’s where Lemonade can help on two fronts.

If your dog is already on a Lemonade Pet accident and illness policy, treatment for ehrlichiosis, including diagnostics like blood work, PCR testing, and doxycycline, may be covered as long as the condition isn’t pre-existing and you’ve kept up with the tick prevention measures your vet recommended. If your vet advised a tick preventative and your dog was on it consistently, you’re in a much better position if your dog still picks up an infected tick. Enrolling before tick season, or before a diagnosis happens, is always the smarter move.

On the prevention side, Lemonade’s Preventative Care packages are designed to help cover the routine costs that keep your dog protected before anything goes wrong. Depending on the package you choose, tick preventatives may be included. If keeping your dog on a consistent tick preventative is a priority (and given the risk of ehrlichiosis, it should be), it’s worth checking your options. Staying consistent with prevention is a lot less expensive than treating an active infection.

Before we go

Ehrlichiosis is a real threat, but it’s also one of the more manageable tick-borne diseases when it’s caught early. If your dog has been exposed to ticks, a routine wellness screen with a SNAP 4Dx test is a simple, fast way to stay ahead of it. And if your dog just tested positive, take a breath: call your vet, ask the questions in this article, and follow their lead on next steps. You’re already doing the right thing by getting informed.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.