What symptoms may indicate heatstroke in dogs or cats?

Common signs include rapid breathing, excessive panting, drooling, lethargy, vomiting, or seizures. If symptoms persist or worsen, contact your vet promptly.

What tests will the vet perform at the clinic?

The vet will typically assess vital signs and arrange blood biochemistry, a complete blood count, and urinalysis. Imaging such as X-rays or ultrasound may be used to evaluate organ damage, with further management based on the results.

What first aid can I give my pet at home?

You can help by applying cool (not cold) wet towels, moving your pet to a shaded area, and offering water to aid cooling. If there is no improvement or symptoms worsen, seek veterinary care immediately.

How can I prevent heatstroke in my dog or cat?

Avoid taking your pet out during the hottest parts of the day, provide a shaded and well-ventilated space with access to fresh water, never leave pets in a closed vehicle, and monitor exercise intensity during summer.

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

Heatstroke & Hyperthermia in Dogs and Cats: Symptoms, Diagnosis & Treatment [2025]

Heatstroke is a life-threatening emergency — a body temperature above 40°C requires immediate cooling. High-risk groups include brachycephalic breeds and overweight pets; delayed treatment can lead to multiple organ failure.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: AVMA, WSAVA, National Taiwan University Veterinary Teaching Hospital

When to See a Vet

Seek Emergency Care Immediately

•Completely unable to stand and unresponsive
•Persistent severe panting or difficulty breathing
•Seizures or uncontrollable full-body trembling

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

•Abnormal lethargy or difficult to rouse but still responsive
•Repeated vomiting or persistent diarrhea over multiple episodes
•Noticeably reduced water intake and unwilling to drink

01What symptoms indicate something is wrong?

During heatstroke or hyperthermia, dogs and cats commonly display a range of abnormal behaviours and physiological signs that owners can observe. Early detection helps ensure prompt veterinary care.

Rapid heart rate or noticeably increased pulse
Rapid breathing or open-mouth panting (particularly in cats)
Unsteady gait, sluggish movement, or weakness
Persistent trembling or involuntary muscle twitching
Confusion, lethargy, or reduced responsiveness
Vomiting, drooling, or inability to eat or drink normally

Seek emergency care immediately if you notice the following symptoms:

⚠️ Sudden hind limb weakness or complete inability to move
⚠️ Unconsciousness or loss of consciousness with no obvious response
⚠️ Rapid breathing or signs of significant respiratory distress

02How to assess the situation at home: observation tips and when to seek emergency care

Observing and documenting your pet's condition at home helps the vet assess the situation quickly on arrival — always note the timing and progression of changes.

Note the time symptoms began, frequency of trembling, and how long each episode lasts
Observe mental status: alert, lethargic, or unresponsive
Record food and water intake over the past 24 hours
Note the frequency of urination and defecation, and any changes in colour or consistency
Weigh your pet and note any weight changes over the past two weeks (if applicable)
If symptoms worsen, arrange a vet visit or emergency consultation immediately

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

Once at the clinic, the vet will prioritise vital signs and use blood tests, imaging, and urinalysis to assess dehydration, organ damage, and complications.

Complete blood count (CBC)

to check for infection, bleeding, or anaemia

Blood biochemistry

to assess liver and kidney function and electrolyte imbalances

Urinalysis

to confirm dehydration and evaluate kidney stress

Chest and abdominal X-rays

to assess organ appearance and detect complications

Ultrasound (abdominal or cardiac)

to evaluate organ damage when necessary

Advanced imaging (CT or MRI)

for further evaluation of complex complications

Choose a clinic that can provide emergency IV fluid therapy and oxygen support

04Treatment and aftercare: medications, dietary adjustments, and home care guidance

Heatstroke treatment focuses on stabilising vital signs and preventing organ damage; follow-up monitoring of temperature, blood values, and clinical signs is essential after discharge.

Intravenous fluids to rehydrate and correct electrolyte imbalances
Supplemental oxygen as needed to address hypoxia
Medications prescribed by the vet to manage complications or inflammation
Continuous monitoring of temperature, heart rate, and respiratory rate
Schedule follow-up visits for blood tests or imaging to monitor recovery
Severe cases may require specialist referral or hospitalisation for observation

05What to prepare before the vet visit: key information to help the vet assess quickly

Record when symptoms first appeared and how they have progressed

Note the frequency of trembling or seizures and any possible triggers

Document food and water intake over the past 24 hours

Record urination and defecation frequency, colour, and any abnormalities

List all current medications and supplements

Prepare a secure carrier and bring any previous test reports or medical records

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.