Dogs Breeds

Hi everyone! I'm a 15 year old student and my teacher wants me to write an article about Dogs and their types. I'm completely unaware of this topic, please help me! If anyone out there can guide me through maximum number of the dogs breeds, please come forward and help me. Tell me about the types, sizes and breeds of the dogs that exists. Although there are numerous breeds of dogs that exist all over the world and it is not possible for any individual to name all of them. Tell me the names of most popular breeds and all those that you can provide me with. Reply on this soon. Thanks!