There may be several reasons why your dog may nudge your face with its nose. First of all, it is a way for dogs to express closeness and friendliness. Dogs have very sensitive noses and can sense their surroundings and other creatures, including humans, through their sense of smell. When your dog gently nudges your face with its nose, it is also smelling you. This is one of the ways dogs express friendship and trust.
Secondly, the dog may be trying to get your attention. If your dog needs to go out for a walk, meal, or play, he may nudge your face with his nose to get your attention. This is one of the ways a dog expresses its needs and expectations. Finally, the dog may be looking for comfort and security. When your dog feels upset or fearful, he may nudge your face with his nose to express his emotion and gain comfort and support from you. This is one of the ways a dog expresses its emotions and needs. In short, when your dog nuzzles your face, he may be expressing friendliness, seeking attention, or seeking comfort. This is a way for dogs to communicate and express themselves with humans, and we should respond to dogs in a gentle way to strengthen the emotional connection between us.