7
Dry Nose
Doggie noses should ordinarily be moist to assist with cooling down. If the nose becomes too dry, the skin can crack and become damaged.
Stress
When you get nervous, you probably have some sort of indicator. In dogs, stress can manifest as excessive nose-licking.
Involuntary Nervous Tick
When a dog has a naturally anxious personality, it may show signs of somewhat excessive nose-licking.
Allergies
Like humans, dogs sometimes suffer from allergies. This could be seasonal or have to do with the environment.
Dehydration
A dog may suffer from dehydration for several reasons, like not having access to enough clean water.