How to Tell If Your Pet Is Sick

Pets can't tell us when something is wrong — which means it's up to us as owners to recognize the signs of illness early. Catching health problems before they escalate can make a significant difference in your pet's recovery and quality of life.

Here are ten of the most common warning signs that your dog or cat may need veterinary attention.

10 Warning Signs to Watch For

  1. Changes in appetite or water intake — Eating significantly more or less than usual, or drinking far more water than normal, can signal conditions ranging from dental pain to diabetes or kidney disease.
  2. Unusual lethargy — If your normally energetic pet is suddenly reluctant to move, play, or engage, this is one of the most reliable signs that something is off.
  3. Vomiting or diarrhea — Occasional upset stomachs happen, but repeated vomiting or diarrhea lasting more than 24 hours warrants a vet visit.
  4. Changes in urination or defecation — Straining to urinate, blood in the urine, or sudden house-soiling incidents can indicate urinary tract infections, blockages, or other serious issues.
  5. Coughing or labored breathing — Persistent coughing, wheezing, or any visible difficulty breathing should be treated as an urgent concern.
  6. Unexplained weight loss or gain — Gradual changes in body weight without a change in diet can point to thyroid disorders, tumors, or metabolic conditions.
  7. Discharge from eyes, nose, or ears — Cloudy, colored, or foul-smelling discharge is often a sign of infection or inflammation.
  8. Lumps or skin changes — New bumps, sores that won't heal, or patches of hair loss should be examined by a vet, as some can be early signs of tumors or skin disease.
  9. Bad breath — While pet breath is rarely minty fresh, a sudden or extreme odor can indicate dental disease or even internal organ problems.
  10. Behavioral changes — Increased aggression, hiding, excessive vocalization, or sudden clinginess can all be responses to pain or discomfort.

When Is It an Emergency?

Some symptoms require immediate veterinary attention — don't wait for a regular appointment if you notice:

  • Difficulty breathing or choking
  • Suspected poisoning (vomiting after eating a toxic plant or substance)
  • Seizures or loss of consciousness
  • Severe trauma (hit by a vehicle, fall from height)
  • Inability to urinate, especially in male cats
  • Pale, blue, or white gums

What to Do If You Notice These Signs

Stay calm and document what you've observed — when it started, how often it occurs, and any other changes in your pet's routine. This information is incredibly valuable to your veterinarian and helps them reach a diagnosis faster.

When in doubt, call your vet. Most clinics are happy to advise over the phone whether something needs immediate attention or can wait for a scheduled appointment. Early action is almost always better than waiting.

Prevention Through Regular Check-Ups

Annual wellness exams allow your vet to establish a baseline for your pet's health, making it easier to spot deviations early. Senior pets — those over seven years of age for most breeds — benefit from twice-yearly visits. Think of regular check-ups as one of the best investments you can make in your companion's long-term health.