Who would have thought that man’s best friend can grow as big as their humans (or even bigger)? Having a dog at home is like having another member of the family. Dogs bring happiness in the home, no matter how big or small they are. As there as small dog breeds, there are also big ones that you won’t believe can become really big. If you want to have one of the biggest dog breeds as a pet, you can choose from any of these 15 breeds.