[DvlshAngel985]

Kaji got neutered yesterday. The vet had me sign all sorts of paperwork, and finally brought out a puppy. It looks like Kaji, and at first acted like my boy, then the anesthesia wore off completely and it wasn't my boy!!!
Kaji is the most mellow easy going dog. That is until he came back yesterday. It's been constant whinning and barking and wanting to do all the things he's not suppose to do. The corrections I used last week, and everything I was able to teach him has flown out the window. He is starting to get unbearable!!! The only break comes when he has tired himself out then it starts all over again.
Are they all like this after a neuter?
Is there something I'm doing wrong?
Is there something I should be doing differently?
Should I ignore his whinning?

HELP!!!!