Correct me if I'm wrong but Dogs are the best thing to ever happen in this world. 
Absolutely without a doubt! I love dogs. They are a member of the genus "canis" (canines), which forms part of the wolf like canines and they're the most widely abundant terrestrial carnivore!
I wonder how long they have been man's best friend?
That's a very good question, the dog was the first species to be domesticated and they have been selectively bred over a millenia for various behaviours, sensory capbilities and physical attributes. Truly a mans best friend! 
Wow, How interesting. I have one a Pitbull and when i'm looking to adopt another soon.
, aiding disabled people and therapeutic roles. This influence on human society has given them the sobriquet of "man's best friend".
Terminology.
- The term "dog" typically is applied both to the species (or subspecies) as a whole, and any adult male member of the same.
- An adult female is a "bitch".
- An adult male capable of reproduction is a "stud".
- An adult female capable of reproduction is a "brood bitch",
Dog
The domestic dog ("Canis lupus familiaris" when considered a subspecies of the wolf or "Canis familiaris" when considered a distinct species) is a member of the genus "Canis" (canines), which forms part of the wolf-like canids, and is the most widely abundant terrestrial carnivore. The dog and the extant gray wolf are sister taxa as modern wolves are not closely related to the wolves that were first domesticated, which implies that the direct ancestor of the dog is extinct. The dog