I'm no pit expert, but it seems the "blues" may of had some other breeds thrown into the mix ,, and that is why some folks see they have a lil less heart than other favors of pits. To some folks on the street, color is primary importance and they'll add anything to the recipe to get blue.
All I know is, they weren't blue 50 years ago!!!
I may not be correct but didn't they get the blue color from the mastiff blue fighting dogs, that were used to attack soldiers in war. Could that be why most pit attacks are from blue pits.
I'm not saying they are all bad, I'm just talking.
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