The word good should never be used in relation to a dogfish!
Having said that the first time I dived with the guy who became my more or less permanent dive buddy I picked up a doggie from the seabed, gave it a bit of a shake and then let it swim off. He was horrified! Swam after it like a thing posessed, knife out, doggie pinned to a rock and beheaded
He collected another few of 'em and then found the bag of swimming headless dogs was becoming a bit of a hindrance. We were only in 15m or so, off up to surface and handed to girlies in the boat. Now they were expecting lobsters so as we left the surface again it was to the sound of screams from the boat crew. We let him eat his doggies alone that night (yuk!), scallops and lobsters for the rest of us.