How to prevent a dog from licking people randomly:

1. Scold it softly. When the dog licks other people’s faces and hands, you should stop it. Let the dog continue licking and scold him softly.

2. Push the dog away to let the dog calm down. When the dog enthusiastically jumps into someone else's arms and licks wildly, you should first push the dog away, let the dog calm down, and then pet it.

3. Use the usual training commands. When the dog keeps licking and kissing, you can also use the usual training commands to command the dog. If the dog obeys the command, give appropriate rewards so that the dog can form a conditioned reflex of being rewarded when not licking and kissing people.

Reasons for dogs to lick people:

1. Express affection for their owners. Dogs will also lick people to express their love for their owners.

2. The owner has just finished eating the delicious food, and the taste attracts the dog, so the dog wants to lick it and taste it.

3. The dog is hungry and wants to eat.