How many years does a guide dog usually need to be trained?

A guide dog needs to be trained for one year and six months, which is 18 months. Guide dogs go through four stages in their life: fostering period, training period, service period, and retirement period. Guide dogs will start training two months after they are born. The significance of long-term training is to enable guide dogs to adapt to the social environment and have the ability to adapt to changes in work.