44. Collie
Everyone knows the famous Collie Lassie, and during that time period, it led to a surge of people searching for this breed to add to their homes. For this reason, many collies were overbred at that time. In turn, it increased the health problems that continue to this day. The collie comes in both the rough and smooth coats, and they are a wide variety of colors as well, including tricolor and blue merle, just to name a few. Originally bred to be herding dogs, they make excellent dogs around children because of their gentle dispositions and the need for companionship.