More: Jack and Jill are the very best of friends. Both have very unique personalities Jack is very outgoing and demands attention from everyone. Jill is a bit more laid back and is ok with just observing in the background They bring great joy to our lives. It is our first experience owning Border Collies. Daily walks or playing fetch are a must with Border Collies. Jack requires constant challenges due to his high intelligence. Jill not so much. She is happy just being curled up on my husbands. FYI - lapdog size she is not. 🤣 We have quickly learned that there is definite truth in that they are truly an intelligent breed.