Its fake:
A. unless the dog is dead or unconcsiou theres no way you can get/keep a hook like that in with no blood or a wound surrounding the area.
B. this looks like a healthy, clean dog with a collar.. so even if the hook is really there
its because of other reasons than sharkhunting.
C. A hook like what in that area wont do it with a shark. If i had to catch a shark
with that dog as my only bait i would attacht the line to it collar..
D. why am i even discussing this?