As far as I know, no U.S. hogs are coming to Canada for slaughter or fattening. Any U.S. hogs entering Canada must be quarantined and comply with CFIA health regulations.
On our end, we certainly ship a lot of hogs to the United States, but I am not familiar with the details of the paperwork that needs to be done. You could ask Mr. Dickson or Mr. de Bruyn.