Good job. Do what you gotta do. I bet the backstraps wouldn't have been damaged
My dog caught a pig once and I dispatched him with a .380 pocket pistol I carry. I put it right against his cranium. Blood splattered all in my face
. Wasn't a pleasant experience but it got the job done. Next time I'll stand back a few feet. I've done several pigs in the heart with a bowie knife and it is pretty quick.
Dispatching an animal by hand is not a pleasant experience but needs to be done from time to time. When I was a kid I shot a dove off the powerline with my BB gun. The BB lodged in the breast but didn't kill the dove. I couldn't bring myself finish it off so I got the BB out and kept it in a crate with corn and water for a while then let him go. Looking back I doubt highly that the bird ever lived and probably suffered greatly from my actions but I didn't know any better at the time. Often times the difficult choice is the right choice. You have to be prepared to carry out that choice.