Symptom: Collapse – Why has my pet collapsed?
Collapse is when a dog or cat suddenly falls over or becomes unable to stand due to a temporary or prolonged loss of strength or consciousness. Some dogs and cats may appear weak or wobbly before collapsing, while others may suddenly fall without warning. The episode may last only a few seconds or continue for several minutes, and some animals recover quickly while others remain weak or unresponsive. Collapse may be accompanied by pale gums, heavy panting, abnormal breathing or twitching movements, depending on the underlying cause.
Written by Gill Burkhill, Veterinary Surgeon, Animal Trust Vets CIC | Published May 2026 | Review date May 2029 | This advice is for UK pets only and is not a replacement for seeing a vet
'My pet has collapsed' - Frequently asked questions
What are the common reasons for my pet has collapsed?
Collapse can occur for a variety of reasons, including:
- Heart disease or abnormal heart rhythms
- Severe blood loss or internal bleeding
- Seizures or neurological disorders
- Respiratory disease causing inadequate oxygen levels
- Metabolic disorders, including low blood sugar and electrolyte abnormalities
Further reading: Congestive heart failure (CHF) in dogs and cats
DOs - My pet has collapsed, what to do at home:
- Keep your dog or cat calm and in a quiet, safe area.
- If they have recovered, keep them rested and prevent further exercise or excitement.
- Check their gum colour and breathing if it is safe to do so.
- Record how long the episode lasted and what happened before, during and after the collapse.
- If possible, take a video of the episode, as this can be very helpful for your vet.
- Contact your vet for advice, even if your dog or cat appears to have recovered completely.
DON'Ts - My pet has collapsed, what not to do at home:
- Don’t force your dog or cat to stand or walk if they are weak.
- Don’t offer food or water until they are fully alert and able to swallow normally.
- Don’t put your hands near their mouth if they are having seizure-like movements or are unresponsive.
- Don’t assume the problem has resolved just because they recover quickly.
- Don’t delay seeking veterinary advice after an unexplained collapse.
My pet has collapsed - when is it an emergency?
Seek immediate veterinary attention if your dog or cat remains weak or unresponsive after collapsing, has difficulty breathing, has pale, blue or grey gums, collapses repeatedly, has suffered trauma, or poisoning is suspected. Even if your dog or cat appears to recover quickly, any unexplained collapse should be assessed by a vet as it may indicate a serious underlying condition.