My 4 year old yorkie has an extremly dry nose. It seems to bother him alot. He is always rubbing his face on the carpet and scratching at it with his paws. It is also VERY sensitive to touch. My other yorkies nose is wet all the time and he never seems to mind if I touch it or rub it or pinch for that matter! I know there is an old wives tale that dry nose is a sick dog........any advice?