Myth #3: A warm nose means your dog is sick.
The reality: If you want to figure out if your dog's ill, look for signs of lethargy, loss of appetite, coughing, vomiting, diarrhea, and other signs of distress. If a dog's nose is cool, he or she may have just had a drink of water. If the nose is warm, the dog may have been out in the sun. To check for fever, feel the dog's head with your hand—although, remember, normal canine temperature is 101 to 101.5°F, so a dog will feel slightly warm to a human even when there is no fever present.