Differences between dog breeds are caused by genetic factors, not environmental factors. The Chihuahua and the Basset Hound are shorter than the other dog breeds. Although the Chihuahua and the Basset Hound are both short, the Chihuahua has lighter fur than the Basset Hound. On the other hand, the Doberman has a short tail and the Alaskan Malamute has a long, curled tail. Not only that, but if you look at the different dogs the Doberman has pointy ears, pointing up, but when you look at the Poodle it has long, fluffy ears hanging down. You might wonder how? All these dog breeds belong to the same family tree, what makes them look so different from each other is there genes (genetic variations). Every dog has a mom and dad, the parents work
