How is mycoplasma infection diagnosed in dogs and cats?

The vet will start with a clinical examination, then use blood tests and a nasopharyngeal swab for PCR or culture to identify the pathogen. Imaging may be arranged if needed, and results will be followed up as directed by the vet.

Can mycoplasma spread to other pets?

Mycoplasma commonly spreads through droplets or close contact. Any confirmed case should be isolated, and food bowls and the environment should be thoroughly cleaned. Ask your vet whether other animals in the household should also be checked.

How soon will symptoms improve after treatment starts?

Most dogs and cats show improvement within a few days to a week of starting treatment, but the full course must be completed and follow-up appointments attended. Recovery time can vary between individuals — your vet will advise.

Will I need a PCR test or bacterial culture at the appointment?

If confirming the pathogen or assessing antibiotic resistance is important, the vet may recommend PCR or culture testing. These tests help guide treatment decisions and isolation measures — discuss with your vet whether they are necessary for your pet.

How much do the tests and treatment for this condition usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Mycoplasma Infection in Dogs & Cats: Fever, Cough, PCR Testing & Treatment [2025]

Mycoplasma can infect multiple organ systems. Dogs commonly develop respiratory infections, while cats are prone to upper respiratory tract and joint infections.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: WSAVA, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Persistent open-mouth breathing or very rapid breathing
•Sudden extreme weakness with prolonged lethargy
•Repeated vomiting or inability to eat for more than one day

Schedule a Clinic Visit Soon (within 24–72 hours)

•Fever lasting more than one day with fluctuating temperature
•Frequent dry cough or cough with mucus-like discharge
•Noticeably reduced appetite with persistent low energy

01What symptoms indicate something is wrong?

Mycoplasma infection commonly causes respiratory and systemic symptoms. Clinical signs range from mild to significant discomfort — assess your pet's overall condition to decide whether to seek veterinary care.

Persistent or intermittent fever lasting more than a day, with fluctuating body temperature
Dry or productive cough with increased frequency or recurring episodes
Sneezing, increased nasal discharge, or a runny nose
Localised swelling, joint discomfort, or lameness (when joint symptoms are present)
Decreased alertness, reduced activity, and noticeably poor appetite
Seek prompt veterinary assessment if breathing sounds change or breathing becomes laboured

Seek emergency care immediately if you notice the following symptoms:

⚠️ Rapid or laboured breathing, or open-mouth breathing, requires emergency treatment
⚠️ Sudden prolonged lethargy or extreme weakness indicates a critical condition
⚠️ Persistent vomiting or inability to eat for more than 24 hours — seek immediate veterinary care

02How to assess an abnormality at home? Key observations and when to seek emergency care

Recording key observations at home helps your vet quickly understand the progression of the illness and how well treatment is working.

Take your pet's temperature at the same time each day and note the reading and time
Record the frequency and timing of coughing episodes, and whether vomiting accompanies them
Film any coughing, breathing, or walking behaviour — capture both front and side angles
Monitor changes in appetite and water intake; record amounts eaten and drunk
Observe urination and defecation patterns; note any abnormalities such as blood
If symptoms worsen or breathing difficulties develop, arrange a vet visit promptly

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, the vet will combine a physical examination with imaging and laboratory tests to confirm whether mycoplasma or another pathogen is responsible.

Physical examination

assessment of breathing, body temperature, heart rate, and overall condition

Blood tests

evaluation of inflammatory markers and organ function

Chest X-ray

checking the lungs and airways for signs of inflammation or infiltration

Pathogen testing

nasopharyngeal or respiratory swab for PCR or bacterial culture

Advanced imaging (if needed)

CT scan for complex or slow-to-recover cases

04How is the condition treated and managed after diagnosis? Medications, diet, and care guide

After diagnosis, follow your vet's instructions to complete the full course of treatment and attend follow-up appointments. Home care and environmental disinfection help reduce the risk of transmission.

Complete the full course of treatment as prescribed and attend scheduled check-ups to monitor response
Return for follow-up blood tests or imaging to confirm recovery of organ function
Isolate the affected pet and increase cleaning and disinfection of food bowls and the environment to limit spread
Adjust diet and monitor recovery of appetite, body weight, and energy levels
Record any medication side effects and proactively report concerns to your vet for follow-up
If symptoms recur or fail to improve, arrange a specialist or hospital referral for further evaluation

05What should I prepare before the vet visit? Key information to help the vet quickly identify the cause

Write down when symptoms started, the order in which they appeared, and how they have changed

Bring your temperature and cough log, along with any videos and photos you have taken

List all current medications, supplements, and known allergies

Research or book in advance at a clinic or hospital equipped with PCR testing and X-ray facilities

Use a secure carrier or lead when travelling to prevent stress from worsening your pet's condition

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.