Crate training is the way to go.. Use all of the above suggestions. (except the puter one maybe).. He is missing him mom and you.. Your sent will help lots. But.. They all whine for a few days up to a week. I had to close the bedroom door my labs crate was in. took three nights and after that She was good. Now all of my dogs 6 of em go to their crates at 10 pm and lay down. They know that's bed time.
Mine did the same. They knew.me and my ex wife's pre bed routine and when. We started locking doors turning off the tv they went ran upstairs and got in their crates