There are several reasons why a dog automatically comes to your door:

1. Hungry: A dog may come to your door automatically because it is hungry and wants you to feed it some food. If you feed your dog at this time, he will appear at your door from time to time asking for food.

2. Estrus: It may be because the estrus period has arrived. This is normal. It is best not to drive it away because of this. It will go on its own.

3. Stray dogs: It may be that the stray dogs want people to take them in. If the family has the conditions, try to take them in or give them to others.