Can you get him to follow your other dog? My dad's Yorkie learned to use the new doggy door within a few hours because he wanted to follow my Yorkie through it so badly, he had to get over his fear.
Although 18 weeks is awfully young. I think mine was about 15-16 weeks when he learned to go up and down stairs by himself, and he's a big Yorkie. Maybe it's just difficult for him to push open the door? |