Because the dog’s nose is relatively sensitive, when you blow directly on the dog, the nose will feel irritated, so you don’t like people blowing on it. Moreover, the dog’s nose is the most sensitive and fragile part of the body. When a large amount of gas and wind enters its nasal cavity, the dog will be very uncomfortable.

And the air we blow will disperse to its face, making it feel uncomfortable, just like a human itching.

The reasons why you cannot blow on the dog are:

1. The sudden blowing wind may frighten the dog, which the dog cannot accept. Yes, they will behave more uncomfortable.

2. Dogs’ noses are relatively sensitive, and you cannot blow into their noses. This is the same reason that you cannot blow a hair dryer directly on the dog’s face after taking a bath. If the wind blows to the dog's head all of a sudden, the dog will struggle very much, even become irritable and bite.

3. Although humans can bear it, dogs cannot. Dogs are different from humans. Things that humans like or accept may not be acceptable to dogs, because dogs’ noses are the most sensitive in the body. If a part is stimulated by a large amount of gas, they will feel very uncomfortable.