I need help determining whether my dog is a full bred pitbull or not. The reason I ask is because his head is not very large like other "pits" and he is not as bulky as those deemed as pits. Based on the pictures, do you think he is? Thanks for your help.

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Your pitt doesn't quite look full bred to me, however with pitt bulls it would be very difficult to determine its breeding by a photo. There are many similar bully breeds which can easily resemble a pitt. You can't ever be 100% certain without a pedigree. Here's a perfect example. Many of these dogs can easily be mistaken as a pitt. Pet Pitbull - Find the Pit Bull