I do not think it has anything to do with the size, it is their personalities. I have a 13 lb Shih Tzu that perfers to be carried in a carrier or ride in a stroller. She is a diva through and through. I also have a 7 lb Yorkie who loves to walk. She will only get in the carrier or stroller when her little legs are too tired to go on. She is the exact opposite of her sister--she is pure tomboy! |