when a dog or puppy has a dry nose, it means that the dog/puppy is sick. when my dog was a puppy, she had a dry nose often, but also didn't much and didn't act sick. if your puppy does not drink...
Well, it depends. The warm nose is just a result of the dog not licking his/her nose. Nobody really "nose" why dogs and cats lick their noses. All people know is that that is a sign of a healthy pet....