Happy-go-lucky is a word that's thrown around a lot to describe beagles. So are sweet, adorable and friendly. While all are true, this may also be a polite way to highlight beagles' personality over their intelligence. Beagles were originally bred as pack-hunting hounds, giving them a gregarious and cheerful nature that makes them perfect for larger families where they can get plenty of attention and feel like part of the team. Admittedly, beagles aren't the most brilliant dogs, which can make them slow to house train. But their friendly temperament, smallish size and good behavior around young children make them a popular choice for families.