What do I do??

So lately our older dog refuses to come inside at night. It's really cold where we live right now. We leave him water on the porch and our yard is fully fenced. The porch is covered and he has a thin bed out there. He has a thicker coat, but I still feel it's too cold for him. He has a hard time walking, but will do his damnedest to run from you and will hide. You can't force him to come in. Idk what to do, but I'm so worried he will get too cold. Any ideas what I could do to either get him to come in or to keep him more warm? He won't accept blankets and will throw them off the porch.

** He is much too large to pick up. He also bites if you try to. Like I said, he runs and hides under the porch and stuff making it impossible to get to him. I have tried bribing, he doesn't respond d to it.