The first injection of six-linked vaccine for dogs should be given more than 30 days after the dog is born, about seven to eight weeks after the dog is born, and at the eleventh and twelfth weeks after the dog is born. The dog is injected with the second six-linked vaccine. When the dog is fourteen to fifteen weeks old, the dog is injected with the third six-linked vaccine. Note that the dog should be injected with rabies during the third injection of vaccine. After the first three vaccinations, the dog only needs to be given one shot of six-linked vaccine and one shot of rabies vaccine every year.