
How to triage a patient and determine if it is stable?
When veterinary professionals perform triage in the emergency room, they follow a structured approach to quickly assess and prioritise patients based on the severity of their condition.
The triage process begins the moment an animal enters the clinic. Veterinary nurses / technicians / veterinarians perform an initial visual assessment, noting signs of distress, pain, or critical conditions such as breathing difficulties, excessive bleeding, or unresponsiveness.
Vital signs like heart rate, respiratory rate, mucous membrane color and body temperature are checked to determine the pet’s overall stability.
In some cases, immediate interventions-such as oxygen therapy, intravenous fluids, or bleeding control-may be initiated before a veterinarian fully examines the patient.
After a quick assessment patients are categorized:
– CRITICAL (immediate attention required): life-threatening conditions such as severe trauma, respiratory distress, cardiac arrest, seizures, collapse. These cases are seen and treated immediately.
– CRITICAL/ EMERGENT (urgent but not immediately life-threatening): conditions such as moderate breathing difficulties, fractures, persistent vomiting that require prompt medical attention whitin a short period.
– STABILE (non-urgent cases): minor wounds, mild lameness, skin infections, mild gastrointestinal issues that can safely wait while more critical patients are treated first

⇒ Triage in Multi-Species Settings: Unlike human emergency medicine, veterinary triage must account for multiple species, each with different physiological norms and responses to illness. For example:
Dogs are more resilient to blood loss than cats. Cats often hide symptom until they are critically ill, making early triage difficult. Exotic animals (rabbits, guinea pigs, birds, reptiles) require specialised triage, as stress alone can worsen their condition.
⇒ Telephone Triage: Veterinary team often provide triage over the phone to guide pet owners before they reach the clinic. It helps veterinary professionals determine whether a patient requires immediate emergency care, urgent assessment, or can wait for a scheduled appointment. Goals of Telephone Triage:
- Identify life-threatening emergencies that require immediate transport
- Advise on first aid measures (e.g. stopping bleeding, keeping a seizing pet safe) to stabilise pet before arrival
- Prevent unnecessary ER visits for non-urgent cases
- Help owners prepare for their visit (e.g. bringing stool samples, avoiding food before surgery)
Here are some key questions to ask owners: Since owners may struggle to describe medical conditions accurately, structured yes/no or multiple-choice questions work best.
1. Consciousness & Neurological Status
“Is your pet conscious and responsive?”
“Is your pet having seizures? If yes, when did they start, and how long do they last? Is this episode happening for the first time ever?”
2. Breathing
“Is your pet breathing normally, or does it seem laboured or noisy?”
“Is your pet panting excessively (if a cat, open-mouth breathing is an emergency)?”
3. Circulation & Bleeding
“Is your pet bleeding? If so, where and how much?”
“Is your pet’s tongue or gums a normal pink color, or are they pale, blue, or yellow?”
4. Vomiting & Diarrhea
“Has your pet been vomiting? If yes, is there blood present?”
“Does your pet have diarrhea? Is it explosive, bloody or black/tarry?”
5. Urination & Defecation
“Is your pet straining to urinate? Have they produced urine?” (Straining with no urine = possible urinary obstruction, a life threatening emergency).
“Has your pet not urinated or defecated in over 24 hours?”
6. Injury & Trauma
“Has your pet experienced trauma, such as a fall, car accident, or attack by another animal?”
“Can your pet stand and walk normally?”
7. Toxin Ingestion
“Has your pet eaten/had access to anything unusual (chocolate, grapes, human medications, rat poison, etc.)?”
⇒ “Reverse Triage” in Mass Casualty Incidents: In situations like disasters, fires, or large-scale trauma (e.g. multi-dog fights), vets may use reverse triage, prioritising patients that are likely to survive with intervention over those with a poor prognosis.
⇒ Triage Decision-making Under Pressure: Sometimes triage is not just about medical urgency-it also considers:
- available resources (e.g. stuff, oxygen cages, ICU space)
- client financial constraints, which may limit treatment options
- ethical considerations, such as when euthanasia may be the most humane choice
To conclude
Triage is a fast and structured process that ensures critical patients receive immediate care while stable cases are managed appropriately.

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