| When to call immediately | Difficulty breathing, collapse, seizure, suspected poisoning, severe bleeding (American Veterinary Medical Association (AVMA)) |
| Normal resting respiratory rate (dogs & cats) | 15–30 breaths per minute (Veterinary general reference ranges) |
| Concerning appetite change threshold | Refusal to eat for more than 24–48 hours (General veterinary guidance) |
| Litter box visits to track (cats) | Straining or no urination in 12–24 hours = urgent (Feline urological syndrome guidance) |
| Weight loss that warrants evaluation | 10% or more of body weight without dietary change (General veterinary clinical reference) |
| Vomiting frequency warranting contact | More than twice in 24 hours, or any blood present (General veterinary guidance) |
How to Use This Guide
This reference is designed for new pet owners who want a reliable starting point when something feels off with their animal. It covers common physical and behavioural changes that veterinarians generally consider worth evaluating — organized so you can find relevant signs quickly.
This Is a Reference Guide, Not a Diagnostic Tool
The signs listed here are general indicators that a veterinary conversation may be appropriate — they are not a substitute for professional diagnosis. Every pet is different, and only a licensed veterinarian can evaluate your individual animal. When in doubt, call your vet rather than waiting.
Pair this guide with understanding what a healthy pet looks like — knowing your pet's normal baseline makes deviations far easier to spot.
Physical Signs That Warrant a Veterinary Call
| When to call immediately | Difficulty breathing, collapse, seizure, suspected poisoning, severe bleeding (American Veterinary Medical Association (AVMA)) |
| Normal resting respiratory rate (dogs & cats) | 15–30 breaths per minute (Veterinary general reference ranges) |
| Concerning appetite change threshold | Refusal to eat for more than 24–48 hours (General veterinary guidance) |
| Litter box visits to track (cats) | Straining or no urination in 12–24 hours = urgent (Feline urological syndrome guidance) |
| Weight loss that warrants evaluation | 10% or more of body weight without dietary change (General veterinary clinical reference) |
| Vomiting frequency warranting contact | More than twice in 24 hours, or any blood present (General veterinary guidance) |
Physical changes are often the most straightforward indicators that something needs attention. Watch for the following:
- Breathing changes: Laboured, rapid, shallow, or noisy breathing is always worth flagging. Open-mouth breathing in cats (outside of extreme heat or stress) is particularly concerning.
- Digestive disruption: Vomiting or diarrhea more than twice in 24 hours, or any instance involving blood, warrants a call. Persistent constipation is also worth reporting.
- Urinary changes: Straining, crying during urination, blood in urine, or a sudden inability to urinate (especially in male cats) can indicate a serious blockage requiring urgent care.
- Unexplained weight loss or gain: A 10% or more change in body weight without an obvious dietary cause is a flag for underlying illness.
- Lumps, swelling, or wounds: New growths, rapidly changing lumps, or wounds that aren't healing normally should be examined.
- Eye or nose discharge: Cloudy eyes, thick discharge, persistent squinting, or a suddenly opaque lens may indicate infection or injury.
- Pale, blue, or yellow-tinged gums: Gum colour is a useful health indicator. Pale or white gums can signal shock; yellow gums may suggest jaundice.
For older animals, many of these signs can emerge more gradually. See how health needs shift as pets age for a closer look at age-specific changes.
Behavioural Signs That Warrant a Veterinary Call
Behaviour shifts are sometimes subtle but equally important. Because pets cannot tell you how they feel, behavioural changes are often the earliest signal that something is wrong.
- Sudden lethargy: A normally active pet that becomes unresponsive, slow, or unwilling to move deserves attention — particularly if it persists beyond 24 hours.
- Appetite refusal: Most healthy pets eat with enthusiasm. Refusing food for more than 24–48 hours, or showing a dramatic change in eating behaviour, is worth reporting.
- Hiding or withdrawal: Animals in pain or distress often isolate themselves. A pet that suddenly retreats, avoids touch, or stops seeking interaction may be communicating discomfort.
- Aggression or sudden temperament change: An unusually irritable or reactive pet — especially one that was previously calm — may be responding to pain.
- Excessive vocalization: Uncharacteristic whining, yowling, or crying, especially around eating, moving, or toileting, may signal discomfort.
- Changes in elimination habits: House-trained pets that suddenly have accidents, or that begin avoiding the litter box, may have medical — not behavioural — reasons for the change.
Reading your pet's body language can help you distinguish between temporary stress and signs of a deeper problem. Additionally, behaviours like hiding and overgrooming can overlap with anxiety — recognizing stress and anxiety in pets covers those patterns in more depth.
Emergency vs. Non-Emergency: A Basic Framework
Not every concerning sign is an emergency — but some are. Use this general framework to guide your response:
| Seek Emergency Care Immediately | Call Your Vet Within 24 Hours |
|---|---|
| Difficulty breathing or choking | Mild vomiting or diarrhea (once or twice) |
| Collapse or loss of consciousness | Reduced appetite for 24 hours |
| Seizures | New lump or growth discovered |
| Suspected poisoning | Mild limping without obvious injury |
| Severe or uncontrolled bleeding | Behavioural changes lasting more than a day |
| Inability to urinate (especially cats) | Eye discharge or squinting |
When uncertain, calling your veterinary clinic and describing the symptoms is always a reasonable first step. Most practices can help you determine urgency over the phone. Routine annual wellness visits are also an important layer of prevention — they allow vets to catch changes before they become emergencies.
This article is for general informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a licensed veterinarian regarding your pet's health.