How to Tell If Your Dog Is Sick

Is My Dog Sick? Here's How to Tell

Dogs can't tell us when they're not feeling well — so it's up to us to notice the signs. The good news is that most health problems give early warning signals if you know what to look for. This guide walks you through the most reliable ways to tell if your dog is sick, what to check at home, and when it's time to call the vet.

1. Changes in Appetite or Water Intake

A dog that suddenly stops eating — or starts eating or drinking much more than usual — is sending a signal. Skipping one meal occasionally is normal, but refusing food for more than 24 hours, or a sudden spike in thirst, warrants attention. Increased water intake can be a sign of diabetes, kidney disease, or Cushing's disease.

2. Lethargy or Unusual Tiredness

If your normally energetic dog doesn't want to play, go for walks, or even get up from their bed, that's a red flag. Occasional tiredness after heavy exercise is normal — persistent low energy is not.

3. Vomiting or Diarrhea

One episode of vomiting or loose stool isn't always cause for alarm. But repeated vomiting, blood in vomit or stool, or diarrhea lasting more than 24 hours needs veterinary attention. See our guides on how to treat dog vomiting at home and how to treat dog diarrhea at home for step-by-step help.

4. Changes in Breathing

Labored breathing, rapid breathing at rest, or persistent coughing are serious symptoms. A healthy resting dog breathes 15–30 times per minute. Anything outside that range — especially if accompanied by blue or pale gums — is an emergency. Learn how to check your dog's breathing rate at home.

5. Abnormal Gum Color

Healthy dog gums are pink and moist. Pale, white, blue, yellow, or bright red gums all indicate something is wrong — from anemia to shock to liver disease. Press on the gum and release: color should return within 2 seconds (capillary refill time). See our full guide on what color should dog gums be.

6. Fever

A normal dog temperature is 101–102.5°F (38.3–39.2°C). Anything above 103°F is a fever. The most accurate way to check is with a rectal thermometer. The iProven DTK-117Y Pet Thermometer gives readings in just 20 seconds with a flexible, comfortable tip — ideal for at-home checks.

🌡️ Recommended Tool: iProven Dog & Cat Thermometer DTK-117Y — Fast 20-second readings, flexible tip, waterproof. Perfect for home fever checks.

7. Abnormal Heart Rate

A healthy dog's heart rate is 60–140 bpm depending on size. You can check this at home with a stethoscope placed behind the left elbow. The 3M Littmann Cardiology IV Stethoscope is the gold standard for clear, accurate readings — even for home use.

🩺 Recommended Tool: 3M Littmann Cardiology IV Stethoscope — More than 2x louder than standard stethoscopes. Ideal for detecting subtle heart sounds at home.

8. Continuous Vital Signs Monitoring

If you want ongoing peace of mind — especially for senior dogs or dogs with known health conditions — a GPS and health tracker like the Tractive Smart Dog GPS Tracker monitors heart rate, respiratory rate, and activity levels 24/7 from your phone.

📡 Recommended Tool: Tractive Smart Dog GPS Tracker — Live vital signs monitoring (heart rate + respiratory rate), virtual fence, bark monitoring. Attaches to any collar.

9. Swollen Abdomen

A bloated, hard, or distended belly — especially if your dog is restless, drooling, or trying to vomit without success — can be a sign of GDV (gastric dilatation-volvulus), which is a life-threatening emergency. Do not wait. Go to an emergency vet immediately. See our guide on signs of bloat in dogs.

10. Limping or Difficulty Moving

Sudden limping, reluctance to put weight on a leg, or stiffness when getting up can indicate injury, joint pain, or infection. See our guide on how to treat dog limping at home and when to worry about dog limping.

11. Scratching, Licking, or Skin Changes

Excessive scratching, licking paws, hair loss, redness, or rashes often point to allergies or skin infections. These are among the most common dog health complaints. See our guides on how to treat dog allergies at home and how to treat dog itchy skin at home.

12. Eye or Ear Discharge

Cloudy eyes, excessive tearing, squinting, or colored discharge from the eyes or ears are signs of infection. See our guides on how to treat dog eye infection at home and how to treat dog ear infection at home.

13. Coughing or Sneezing

Occasional sneezing is normal. Persistent coughing — especially a honking cough — can indicate kennel cough, heart disease, or tracheal collapse. A cough that produces mucus or blood needs immediate vet attention.

14. Unusual Lumps or Bumps

Run your hands over your dog regularly. New lumps, bumps, or swellings — especially ones that grow quickly or feel hard and fixed — should be evaluated by a vet. Not all lumps are cancer, but all new lumps deserve a look.

15. Behavioral Changes

Hiding, aggression, whimpering, or sudden clinginess can all be signs of pain or illness. Dogs instinctively hide weakness, so behavioral changes are often the first — and only — clue something is wrong. See our guide on signs your dog is in pain.

When to Go to the Vet Immediately

Some symptoms require emergency care — don't wait for a regular appointment if your dog shows:

• Difficulty breathing or blue/white gums
• Suspected bloat (distended belly + unproductive retching)
• Seizures or collapse
• Suspected poisoning
• Severe bleeding that won't stop
• Loss of consciousness

For non-emergency situations, having a well-stocked first aid kit at home buys you time and helps you act fast. The EVERLIT Pet Medic First Aid Kit includes 95 vet-approved supplies in a compact travel bag.

🧰 Recommended Tool: EVERLIT Pet Medic First Aid Kit (95 Pcs) — Vet-approved, travel-friendly, covers wounds, bandaging, and emergency care for dogs and cats.

Final Thoughts

You know your dog better than anyone. Trust your instincts — if something feels off, it probably is. Use this guide as a starting checklist, and don't hesitate to call your vet when in doubt. Early detection almost always leads to better outcomes.

Explore our full dog health series for step-by-step guides on treating the most common conditions at home.