Maybe his parents had kicked him out, for, being small perhaps. If his sister was bigger, than she would be safe, or at least that would be hoped so. Since it was no sure yes, Amber couldn't work on it. Whatever the case, the pup in front of her appeared to be freezing, and as a grown wolf, it was her duty to protect him until an actual mother could be found. That meant if he froze to death on her watch, she herself was not worthy of her own children, unless there really was nothing she could have done.
"Thank you for the offer, young one" her rough, gentle voice told her kindly, before she gave a great shake. This was to remove any water or snow on her at that exact moment. Then it was the chore of flattening herself out, and squeeze into what he had claimed for himself. It wasn't really a cave, but more like a warped overhang he was under. The outside was low, but then it angled up, giving a greater height under it. Once she was underneath the rock, the female wrapped herself around the young male pup. His fur was like ice to her boiling pelt.
"I hope I'm not too cold" Amber joked to him, and would be unsurprised if it took him only a matter of seconds to drift off.