Welcome to YT!! I think it's safe to say that we all on here DO NOT use collars for walks with out babies. This breed is prone to problems with their little throats, it's best we don't aggravate it. Your baby is still very young, and will take some working with to get him use to collars and harnesses. Walking on a leash will be another adventure all together. Just be patient, treat for good behavior, and if you need help, don't hesitate to post.