Dogs · Myth check · Verdict: Not supported
A warm, dry nose means your dog is sick
Gilbert JonesResearch summary · sources below · Reviewed October 17, 2026Where the idea comes from
A cold, wet nose is common in healthy dogs, so people started treating it as a health check. But a nose is affected by lots of everyday things: sleeping, sunshine, a warm room, licking, wind and exercise.
What vets say
Veterinarians interviewed by WebMD call the belief false. One vet put it simply: nose moisture is “just not a reliable sign.” A dog with a serious illness can still have a cool, damp nose. A very dehydrated dog may have a dry nose, but you would usually see other signs too.
Better signs to watch
- Not eating, or eating much less
- Drinking a lot more, or much less, than usual
- Low energy, hiding or unusual behaviour
- Vomiting, diarrhoea, coughing or trouble breathing
- A nose that is cracked, crusty, bleeding or has thick discharge
If you think your dog has a fever, the only reliable check is a thermometer. Ask your vet how to take your dog’s temperature safely.
What the evidence says
A warm, dry nose is a reliable sign of illness
Not supported evidenceNose temperature and moisture change from hour to hour in healthy dogs. Vets don’t use it to judge health.
Changes in eating, drinking and behaviour are better warning signs
Moderate evidenceThis is standard veterinary guidance, though it comes from clinical experience rather than formal studies.
Related notes
Can dogs eat grapes or raisins?
No. Grapes, raisins, sultanas and currants can cause sudden kidney failure in dogs, and there is no known safe amount. If your dog eats any, call your vet or a pet poison line straight away, before signs appear.
Is chocolate dangerous for dogs?
Yes. Chocolate contains theobromine, which dogs clear very slowly. The darker the chocolate, the more dangerous it is. Cocoa powder and baking chocolate are the worst, white chocolate has very little.
Dogs only see in black and white
Not true. Dogs see colour, just fewer colours than we do. They see blues and yellows well, while reds and greens look dull, greyish or brownish to them.