My Dog Has a Persistent Cough and Pale Gums. Could It Be Mycoplasma?
Symptoms, treatment, and what type your dog actually has.
Mycoplasma in dogs isn’t one single disease. It’s a family of tiny bacteria that can do very different things depending on which type your dog has: some live harmlessly in the body, others trigger a respiratory infection, and still others attack red blood cells directly. Knowing which is which matters a lot.
TL;DR
- Mycoplasma” covers two very different infections in dogs: a respiratory form (Mycoplasma cynos) that contributes to kennel cough, and a blood form (Mycoplasma haemocanis) that destroys red blood cells and can cause anemia.
- Coughing and breathing issues point to the respiratory form, while pale gums, weakness, and fatigue suggest the blood form.
- Diagnosis often involves a PCR test, which identifies the specific bacteria by its genetic material. Treatment usually includes antibiotics like doxycycline.
- The risk of mycoplasma spreading to humans is considered very low, but talk to your vet if you have concerns.
- Mycoplasma is covered under Lemonade Pet illness coverage, as long as it’s not pre-existing and develops after waiting period has passed.
What is mycoplasma in dogs?
Mycoplasma bacteria are unusually small and lack the outer wall that most bacteria have. That structural quirk matters because it makes them invisible to some common antibiotics that work by targeting that wall. They’re found in dogs naturally (on the skin, in the mouth, and in the respiratory tract), and many dogs carry them without ever getting sick.
The trouble starts when the bacteria overgrow, when your dog’s immune system is weakened, or when a more aggressive strain takes hold. At that point, a mycoplasma infection can become a real problem, and the right response depends entirely on which type is involved.
Respiratory vs. blood: two very different mycoplasma infections
Mycoplasma cynos and Mycoplasma haemocanis share a name and nothing else. Here’s how they compare:
| Mycoplasma cynos (respiratory) | Mycoplasma haemocanis (blood) | |
|---|---|---|
| Where it lives | Respiratory tract | Red blood cells |
| What it does | Contributes to kennel cough and lung infections | Triggers the immune system to destroy red blood cells |
| Result | Coughing, pneumonia in severe cases | Hemolytic anemia |
| How it spreads | Dog-to-dog contact; kennels, shelters, dog parks | Primarily through tick bites |
| Dogs most at risk | Recently boarded or sheltered dogs | Splenectomized or immunocompromised dogs |
| Treatment | Doxycycline, supportive care | Doxycycline, sometimes blood transfusion or steroids |
Mycoplasma cynos: the respiratory form
Mycoplasma cynos is one of several bacteria involved in canine infectious respiratory disease (CIRD), the umbrella condition most people know as kennel cough. It’s often a secondary infection, showing up alongside viruses like canine parainfluenza or Bordetella and making the illness worse and harder to shake. Mycoplasma pneumonia in dogs, where the infection spreads deep into the lungs, is a more serious outcome that requires prompt treatment.
Mycoplasma haemocanis: the blood form
Mycoplasma haemocanis attaches to red blood cells (the cells that carry oxygen through the body), causing the immune system to attack and destroy them. The result is hemolytic anemia, a condition where the body breaks down its own blood cells faster than it can replace them. It’s transmitted primarily through ticks, so it’s worth checking for tick exposure if your vet suspects this type.
Mycoplasma in dogs symptoms
Because these are two different infections, the signs look completely different too.
Respiratory form (Mycoplasma cynos):
- Persistent cough, sometimes with a honking or wet sound
- Nasal discharge
- Lethargy and reduced appetite
- Labored or rapid breathing in more serious cases
- Fever
Blood form (Mycoplasma haemocanis):
- Pale or whitish gums (a sign of anemia)
- Unusual fatigue or weakness
- Rapid breathing or heart rate as the body compensates for low oxygen
- Loss of appetite and weight loss
- Jaundice (yellowing of the skin or eyes) in severe cases
Pale gums especially are a signal to go to the vet right away – don’t wait on that one.
How vets diagnose and treat mycoplasma in dogs
Diagnosis
Vets typically use a PCR test (polymerase chain reaction) to confirm mycoplasma. Think of it like a genetic fingerprint test: it identifies the specific bacteria by looking for its DNA in a sample from your dog’s airway, blood, or other tissue. PCR is more accurate than a standard culture, which can be tricky with mycoplasma because of how slowly it grows.
For the blood form, vets may also examine a blood smear under a microscope to spot the bacteria attached to red blood cells, alongside bloodwork to assess the severity of the anemia.
Treatment
Mycoplasma treatment almost always involves antibiotics. Doxycycline is the most commonly used option for both forms, and it works against mycoplasma precisely because it doesn’t target cell walls (since mycoplasma doesn’t have one). Your vet may recommend a course of several weeks, especially for the blood form.
For the respiratory form, supportive care matters too: rest, hydration, and sometimes a cough suppressant or anti-inflammatory medication. For severe anemia from the blood form, a dog may need a blood transfusion or steroids to calm the immune response while the antibiotics do their work.
Is mycoplasma in dogs contagious to humans?
The risk is considered very low. The canine strains of mycoplasma, including Mycoplasma cynos and Mycoplasma haemocanis, are not the same as the human strains that cause respiratory illness in people.
That said, if someone in your household is immunocompromised (meaning their immune system is weakened, such as from chemotherapy or an autoimmune condition), it’s always worth having a conversation with both your vet and your doctor. They can give you guidance specific to your situation.
Does pet insurance cover mycoplasma in dogs?
Between the PCR testing, bloodwork, antibiotics, and potential specialist care, the cost of diagnosing and treating a mycoplasma infection can add up quickly.
Mycoplasma (both the respiratory and blood forms) is classified as an illness, and is covered under Lemonade Pet illness coverage, as long as it’s not pre-existing and develops after the 14-day illness waiting period has passed. If your dog is showing signs before you enroll, that condition won’t be covered. If your dog is healthy right now, this is the moment to think about coverage, not after a diagnosis lands.
Before we go
Mycoplasma in dogs sounds like one thing but is really two very different problems depending on which type your dog has. The respiratory form shows up as a cough and can be a player in kennel cough and canine infectious respiratory disease. The blood form quietly attacks red blood cells and can cause serious anemia. Both are treatable, especially when caught early. If you’re seeing a persistent cough, pale gums, or unusual fatigue in your dog, don’t wait it out.
Frequently Asked Questions
What is mycoplasma in dogs, exactly?
Mycoplasma are tiny wall-less bacteria that can live harmlessly on your dog or cause infection. In dogs, the two most clinically significant types are Mycoplasma cynos, which affects the respiratory tract, and Mycoplasma haemocanis, which attacks red blood cells.
How do dogs get a mycoplasma infection?
The respiratory form often spreads in environments with many dogs, like shelters or boarding facilities. The blood form (Mycoplasma haemocanis) is primarily transmitted through tick bites, so tick prevention is an important protective step.
How is mycoplasma in dogs diagnosed?
Most vets use a PCR test, which identifies the bacteria by its genetic material and is more reliable than a standard culture. For the blood form, your vet may also examine a blood smear under a microscope and run a full blood panel to check for anemia.
What antibiotics treat mycoplasma in dogs?
Doxycycline is the most commonly recommended antibiotic for mycoplasma in dogs. It works well because it targets how bacteria function internally, rather than attacking a cell wall – which mycoplasma doesn’t have. Your vet will determine the right dose and duration for your dog.
Can mycoplasma in dogs spread to humans?
The risk is considered very low. Canine mycoplasma strains are different from the ones that infect humans. If someone in your home has a compromised immune system, speak with both your vet and your doctor to be safe.
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