18. Rottweiler
The Rottweiler is a German breed that was bred to drive cattle to the market. This explains why they have such big heads and large chests. They have a deep rough bark, and people use them to protect their property. They can become giant goofballs with people they’re familiar with, willing to roll over for a tummy rub whenever the chance presents itself. You need a firm hand due to their size and strength, and they can be a little stubborn at times, so they’re not the best breed for someone who is getting their first dog.