Hmmm.
Interesting question. I don't think I could shoot a horse, either. Well, my mom had this one horse... I probably could have shot that SOB. He would try to scrape you off on tree limbs and everything. We usually carried a baseball bat to deter him. Stubborn as hell, he was.
Unicorns would definately get shot. I heard that their horns disappear when you shoot them, though, so then they would just look like a horse. Is the meat still magical after they die? Because I'd like to eat some if it is.
Dogs, well.. it depends on the dog. I love dogs (and have two at the moment), but if they try biting me, my fiancee, or my kid... then it's death by lead poisoning. I've had dogs all my life, and only ever had to shoot one. Not his fault at all. Sad day for me, it was just his time. Crazy strays get shot just like anything else.
Cats? Ha. Just tell me where. My mom has two, and I have all I can do to keep from snapping their necks and tossing them in the trash can every time I visit.
Giraffes? I don't think so. Never tried the meat, though. Maybe that would change my mind.
I don't really get killing bear cubs. I don't know, if you're gonna eat them, fine. If you're gonna try to brag to me about killing one, I don't want to hear it.
I used to have a thing about doves. I wouldn't kill them no matter what. I think it has something to do with my mom telling me they were "god's birds" when I was a kid. I shot a few last year, and it felt odd. They were good, though!
I had a problem with killing squirrels when I was about 10 or so. Not so much a problem with shooting them, I just didn't like finishing them off with the butt of a gun. I always would, though, and I got over it pretty quick.
Never had a problem with deer. They are a lot of food, and the dam things are everywhere. They're so stupid, too.
Somebody earlier mentioned condors. Hmmm.. That's a good one. Being endangered, no. If they were everywhere, you bet your ass I would. We already have tons of vultures. I'd shoot the vultures first.
Snakes... yes and no. Rattlesnakes/copperheads....dead. Black snakes, depends. I've seen sooo many black snakes (I mean HUGE dens where they've taken over entire houses and barns) Yes, they eat mice and other pests, but there doesn't seem to be a shortage of them. If I see like 5 black snakes together, I'll shoot a couple of them for target practice. King/milk snakes... never. Never ever. I almost smacked a guy once.....