Hypoxemia means the oxygen level in the blood is too low. Common signs include rapid breathing, reduced activity, or darker gum colour. If you suspect it, take your pet to a vet promptly for assessment.

How can I monitor for possible low oxygen at home?

You can record breathing rate, whether there is open-mouth breathing, coughing frequency, and changes in gum or lip colour. Videos are also helpful for your vet.

What tests are usually done at the clinic?

Your vet may perform a physical examination, blood tests including blood gas analysis, chest X-rays, and, if needed, an echocardiogram or advanced imaging to find the cause of low oxygen and stabilise your pet.

Can I wait if my pet's gums look blue or purple?

Blue or purple gums or lips usually indicate severe low oxygen or poor circulation. Seek veterinary care or contact an emergency vet immediately rather than waiting.

How much do the tests and treatment usually cost?

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

Disease Guide

Hypoxemia in Dogs and Cats: Breathing Difficulty, Oxygen Tests & Care [2025]

Hypoxemia is an emergency condition where there is not enough oxygen in the blood. It may be caused by lung disease, heart disease, or airway obstruction. Prompt oxygen support and diagnosis are needed, as delays can lead to organ damage.

Take 1 minute to check the symptoms first

Last updated: 2025/12/16

Pethealthmap Editorial Team

Sources: ACVIM, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek emergency care immediately

•Very rapid breathing with open-mouth breathing that does not improve
•Obvious purple or blue discoloration of the lips or gums
•Collapsed or lost consciousness with no spontaneous breathing

Schedule a clinic visit soon (within 24–72 hours)

•Persistent or worsening recurrent cough
•Noticeably reduced activity, reluctance to exercise, or lethargy
•Resting respiratory rate significantly higher than normal

01What symptoms suggest something is wrong?

Hypoxemia often shows up as changes in breathing and alertness. Early recognition helps pets receive timely veterinary care and treatment.

Persistent or repeated coughing, especially worse at night or after activity
Shallow or noticeably faster breathing, panting, or laboured breathing
Open-mouth breathing or using the abdomen to breathe
Low energy, a clear drop in activity, or unusual sleepiness
Lips or gums that look dark, purple, or blue
If signs suddenly worsen or severe symptoms appear, seek veterinary care as soon as possible

Seek emergency care immediately if you notice the following symptoms:

⚠️ Severe breathing difficulty or inability to breathe normally
⚠️ Collapse or loss of consciousness
⚠️ Clearly purple or blue lips or gums (cyanosis)

02How can I assess changes at home? Key monitoring points and when to seek emergency care

Systematic home records can help your vet assess the condition and how it is changing more quickly.

Record how often coughing occurs, how long each episode lasts, and when it happens
Take videos of breathing or coughing from the side and close up to show your vet
Measure and record changes in breathing rate at rest and after activity
Watch for and note changes in appetite, drinking, urination, and stools
Record when signs started and when they worsened or improved
If acute worsening signs appear, go to a vet immediately or phone an emergency clinic

03How will the vet diagnose it? Common tests

At the clinic, imaging and blood oxygen or blood gas testing are usually central to finding the cause of low oxygen and stabilising the pet first.

Physical examination

listening to the chest, lungs, and heart, and checking breathing pattern and gum colour

Blood tests and arterial blood gas analysis to assess oxygenation and carbon dioxide levels

Chest X-rays to evaluate lung changes and heart size

Echocardiography to assess heart function and possible heart disease

Advanced imaging such as CT may be used for complex or localised lung disease assessment

Choose a clinic or hospital with imaging and blood gas analysis capability where possible

04How is it treated and cared for after diagnosis? Medication, diet adjustments, and care guide

Treatment addresses both the symptoms and the underlying cause, with follow-up used to assess prognosis and response to therapy.

The treatment plan is adjusted by the vet according to the cause and test results
Oxygen support may be given when needed, with hospital monitoring arranged depending on severity
If the condition is heart-related, weight and diet management plus heart function follow-up may be needed
Regular follow-up chest imaging, blood oxygen checks, or blood gas tests may be arranged to assess response
Rechecks review medication response and clinical improvement, with follow-up frequency adjusted as needed
For complex cases, referral to a cardiology or respiratory specialist is recommended for further assessment

05What should I prepare before seeing the vet? Key details that help identify the cause quickly

Record when signs started and how they have changed, including when they became more severe

List all current medicines, prescriptions, supplements, and health products

Bring videos of breathing or coughing from the side and close up to help diagnosis

Record details of changes in appetite, water intake, urination, and stools

Bring any previous X-rays or test reports if available

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.

Related Symptoms (You May Also Be Looking For)

Collapse

Sudden weakness

Cough

Forceful air expulsion from airways

Cyanosis

Bluish discoloration

Dyspnea

Difficulty breathing

Exercise Intolerance

Reduced exercise capacity

Open-Mouth Breathing

Mouth breathing