The owner can take the dog out for a walk when it is 3 months old and has been vaccinated. Before a dog is vaccinated, its body resistance is relatively weak and it is easy to be infected by germs when going outside. If it is accidentally infected with infectious pathogens, it will pose a threat to the dog's life.
Therefore, it is generally recommended that owners take their dogs out for a walk after they have received all the vaccines and the immunity is successful. In addition, owners should be careful to prevent their dogs from picking up and eating random things when walking their dogs.