I suggest that you are a very empathetic person. :-)

If it's under your shed there is not much you can do. If it is fatally injured it will probably stay under the shed. Live catch traps work very well with groundhogs, I use cantaloupe as bait and set the trap right near the entrance to the burrow/hole under my shed. However, if the groundhog has severe injuries it is doubtful it will be interested in emerging and eating. Watch and wait is really your only option right now.

Thanks. I wouldn't mind if my dog killed it as she has done in the past. It's nature running its course and it saves my garden. But she's an old lady now and I guess can't shake a big hog dead fast like she used to. She's all beat up and the poor hog is under my shed likely suffering. I'd put it out of its misery if it was accessible. I guess we just have to wait and try to remove the carcass if there is one.

Before long a coon will take residence under the shed and will eat the carcass. Unless your security guard gets to it, then you may have two carcasses.

Yeah, I think I'd just wait and see. Yes, it's hard not to feel bad for injured animals. Maybe I'm mistaken, but I don't think it's nature's course when wild animals are killed by domesticated animals.