In this case I agree with Canada.
Importing creatures can be extremely hazardous, he knew the laws, he decided to try to go to Canada with it AGAINST those laws, he is a dumba$$ for raising ll this trouble for a rodent.
He filled out the apropriate forms, and government agents let him enter the country with the animal. He did not smuggle it.
Since it was their error, and the animal has been certified disease free, he should be allowed to keep it.
At least until hunting season.
So9