Corso or Bullmastiff

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Barked: Wed Feb 15, '12 7:48am PST 
Hey there,
My boy Leo is 11-months old, brindle, weighing in at 100lbs (although he probably should be heavier after suffering through a stomach condition for the past month where he lost his appetite and some weight). Anyways, I was told he was a Bullmastiff when I rescued him, but I am beginning to suspect he is a Cane Corso. What do you guys think?