One way I'd think to try would be to find it's ID after fighting it for a while. If it's not found, you certainly may have killed it, but, it could also have re-targeted something else. For that, before I'd go and kill the para-ridge, I'd count the existing corpses in the area, so that if that number increased after the ID had not been found, I'd be willing to that it's dead.
You could even go as far as getting the #pixcol of the corpse to confirm that it is a dead gold (para) ridgeback. Reason being, not everyone may have the ability to hunt alone killing the same things.