I think this is a bad thing to do to some extent. Sometimes when humans assess human qualities to animals, it ends up causing the animal more suffering. Especially with an injured or ill animal.....
Though we treat our animals just as well, or sometimes better than our human guests, we still have to remember that any animal is still an animal and human feelings cannot get in the way of the health and well being of the animal.
However with that being said, as long as it doesn't present danger to the animal, then I say "why not?"