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Just because a dog has a hot or dry nose does not mean that they are sick. This is an old wive's tale that is false. A dog's nose can change from day to day or even several times a day. It could be hot, cold, moist, or dry but none of these things are directly related to a dog's health.
There are plenty of better indicators that your pooch is sick. For example - body temperature (taken with a thermometer), loss of appetite, presence of vomiting/diarrhea, weight loss, lethargy, and much more. Many people may come to the conclusion that their dog is sick when seeing one of these symptoms. Afterwards, they decide to check the dog's nose and decide that because it's hot, their dog must have a fever.
Signs of sickness that actually do involve the nose include nasal discharge. If you see mucus or a clear discharge coming from your dog's nose and it's accompanied by sneezing and/or coughing then something could be wrong. Your dog could potentially have a "cold". A trip to the vet can verify exactly what is going on in this case.
It's great to be in-tune with your dog's body and it's changes, but just remember that a dog's nose temperature is not a good way to diagnose an illness.