Black Labrador Puppy white chest spot

Hello,
I own a black lab Puppy which I got from pet shop, but pablo has developed a white chest spot on his chest,I am uploading the photos please suggest whether it is a pure bred or not.

 

Hi Satyam and welcome to the forum. Unfortunately, it is against the rules to post photos asking for verification of pedigree:

Moderator Note: f) Requests for confirmation of pedigree/ID Forum members may not post photographs of their dogs for the purpose of asking other members to confirm that their puppy/dog is a pedigree dog.

You can read the full rules here: http://thelabradorforum.com/threads/forum-rules-please-read-before-posting.1599/