Wow, that's really good! Looks like a screenshot from a movie, the only concern I have is with the front-left paw(one with armband or something on it) looking like it's been snapped to one side. Also the front-right leg looks a little off too but it could be just me. Other than that it's excellent work! 4 hours at a constant? Very good work!
aaahhh dljbdcudcbj! omg,its so amazing! thank you sooo much! I love this,its perfect the eyes,the teeth,the chains the everything! sorry he was so hard to do ^_^' but the effort really shows I like the way you did the tracker and the blood looks great the shading is awesome and so is the perspective the expression is wonderful and the overall mood of the whole thing is just amazing,I love this so much!