The biggest dog in the world is Turkish Shepherd Dog.
These Turkish Shepherd Dogs are only 11 months old. This Turkish Shepherd dog is not Sivas Kangal dog. Both of them are specialised for Turkey but they are different.
If you search for internet to have Turkish Shepherd dogs, there are lots of person to send all over the wold.
Turkish shepherd dog couple are here. That is the worlds largest dog.
This is not Turkish Kangal dog. This is a kind of Anatolian Shepherd dog. This one is the biggest dog in the world. You could watch and see their video in here.
That is the link of the biggest dog in the world : https://www.youtube.com/watch?v=0LQwSqoaTmE