7d Focus Problems

Hello All, I have been having some focus issues with my Canon 7d and I am posting some samples here to share.I believe this to be a problem with the camera, not user error. for this shot i was using a sigma 50/1.4, the auto focus is on, i am selecting a focus point manually (directly over the dogs eye), i have focus priority set in my custom functions. this one is in ai servo and i give enough time to hunt for focus between shots. Handheld. this one is focus. This on is not in focus. no settings have been changed, i have not...