Dog Breathing Heavy and Shaking: Causes and When to Worry
When a dog is breathing heavily and also shaking or trembling, the combination can be unsettling. These signs together may reflect pain, fever, anxiety, toxin exposure, or heatstroke, and the context in which they appear helps determine the most appropriate next steps.
Published: 2026-07-29 | Updated: 2026-07-29 | Reading time: 6 min
Quick Answer
Heavy breathing with shaking or trembling in dogs can be associated with several causes, including pain, fever, anxiety or fear, toxin ingestion, and heatstroke. The appropriate response depends on the context: a dog that has been in a hot car requires immediate emergency care, while a dog that trembles during fireworks may be experiencing a stress response. When the cause is unclear, veterinary guidance is recommended.
SYMPTOM TRIAGE
Answer a few questions about your dog's signs and receive general guidance on how urgently to seek veterinary care.
This tool does not diagnose conditions or replace a veterinarian.
Recognising the Signs
Shaking in dogs can take different forms. Muscle tremors involve rhythmic, involuntary movements and may indicate pain, toxin exposure, or neurological issues. Shivering, which is often less rhythmic, can be triggered by cold, fear, or excitement. Generalised trembling may accompany stress responses or metabolic disturbances.
Heavy breathing, as discussed, may include panting, open-mouth breathing, or visible effort to draw breath. When these two signs are present together, consider the situation:
- Did the signs appear after exposure to heat, a stressful event, or a possible toxin?
- Is the shaking localised (one limb) or generalised (the whole body)?
- Is the dog able to settle briefly between episodes, or are the signs continuous?
Possible Causes
Fever. An elevated body temperature can cause a dog to shiver as the body attempts to regulate its temperature. At the same time, increased metabolic demands and the body's natural cooling mechanisms may lead to heavier breathing. Infections, immune-mediated conditions, and certain inflammatory diseases can all produce fever.
Pain. Dogs in pain may breathe rapidly as part of a stress response, and trembling is a common pain indicator. Abdominal pain from pancreatitis, orthopedic pain from injury, or back pain from disc disease can all produce this combination. A dog that resists being touched in a specific area may be localising the pain.
Anxiety, fear, or stress. Situations such as thunderstorms, fireworks, travel, or changes in the household can trigger a stress response that includes heavy panting and trembling. The signs often resolve once the stressor is removed, though some dogs may require behaviour support or, in certain situations, short-term veterinary guidance.
Toxin exposure. Ingestion of toxic substances, including chocolate, xylitol, certain plants, rodenticides, or human medications, can affect the nervous system and cause tremors and rapid breathing. Gastrointestinal signs such as vomiting, drooling, or diarrhoea may also develop. Time is often an important factor with toxin ingestion, and prompt veterinary contact is recommended.
Heatstroke. Dogs that have been in hot environments, especially without adequate shade or water, or that have been exercised vigorously in heat, can develop dangerously high body temperatures. Heavy panting is an early cooling attempt, and shaking may follow as the body's systems become affected. Heatstroke is a medical emergency and requires immediate veterinary attention.
Hypoglycaemia. Low blood sugar, which can occur in small-breed puppies, dogs with diabetes receiving too much insulin, or dogs with certain liver conditions, may produce trembling and rapid breathing. Weakness, confusion, and in severe cases, collapse or seizures can also occur.
Neurological conditions. Certain neurological disorders, including canine distemper, seizures, or conditions affecting the brainstem, can cause tremors and altered breathing patterns. These conditions typically involve additional neurological signs such as head tilting, circling, or loss of coordination.
What to Do While Assessing the Situation
A few practical steps can help keep the dog safe while you decide on the next course of action:
- Move the dog to a cool, quiet, and well-ventilated space if heat or stress may be a factor
- Avoid restraining the dog tightly, as this may increase anxiety or pain
- Check the gums: pink and moist is normal; pale, blue, grey, or dry gums are concerning
- Note the timeline: when did the signs start, and what was happening just before
- Do not offer food or water if you suspect toxin ingestion, as this may accelerate absorption
- If heatstroke is possible, cool the dog gradually with tepid (not ice-cold) water and seek veterinary care
When to Contact a Veterinarian
Seek emergency veterinary care immediately if you observe:
- Signs following exposure to high temperatures, especially if the dog was in an enclosed vehicle
- Suspected or confirmed ingestion of a toxic substance
- Tremors that are progressing, spreading, or accompanied by loss of coordination
- Pale, blue, grey, or white gums
- Collapse, seizures, or inability to stand
- Heavy breathing that is clearly laboured with open-mouth breathing and distress at rest
Schedule a veterinary appointment if:
- The shaking and heavy breathing are mild but have lasted several hours without improvement
- The dog seems painful or resists being handled
- Episodes are recurring without an obvious trigger
- The dog has a known condition such as diabetes or epilepsy that may be contributing
Frequently Asked Questions
Could my dog be shaking and breathing heavily because of anxiety?
Stress and anxiety can certainly cause both heavy breathing and trembling in dogs. If the signs coincide with a known stressor such as loud noises, a new environment, or separation, and the dog returns to normal once the trigger is removed, anxiety is a plausible explanation. However, if the signs persist, worsen, or appear without an obvious cause, other possibilities should be explored with a veterinarian.
How can I tell if my dog has heatstroke?
Heatstroke signs include heavy panting, excessive drooling, red or darkened gums, vomiting, diarrhoea, wobbling, and collapse. The dog may have been in a hot car, exercised in warm weather, or left without shade. Heatstroke can progress rapidly and is life-threatening. If you suspect heatstroke, begin cooling the dog with tepid water and transport to a veterinarian immediately.
My dog trembles sometimes but seems otherwise normal. Should I be worried?
Occasional trembling in an otherwise healthy, alert dog can have benign explanations such as dreaming, cold sensitivity, or mild excitement. However, when trembling is accompanied by heavy breathing, occurs at rest, or becomes more frequent or intense, it is worth having a veterinarian evaluate the dog to rule out underlying conditions.
SYMPTOM TRIAGE
Heavy breathing with shaking can arise from several different causes, and the context matters. A short symptom assessment can help you determine whether your dog may need urgent veterinary attention.
Sources
- Merck Veterinary Manual: "Heatstroke in Small Animals"
- American Kennel Club: "Why Is My Dog Shaking?"
- VCA Animal Hospitals: "Tremors in Dogs"
- ASPCA Animal Poison Control: "Common Pet Toxins"
Disclaimer: This article and the PawAI Symptom Triage tool provide general educational information only. They cannot examine your pet, make a diagnosis, or replace advice from a licensed veterinarian. Contact a veterinarian promptly if symptoms are severe, worsening, persistent, or accompanied by emergency warning signs.