Under Icelandic law, pets entering the country can only pass through Keflavík International Airport, must have the proper paperwork, and must be quarantined for a month, reports the Iceland Review.
A Swiss woman, reportedly in her 60s, tried to bypass those restrictions by entering the country via ferry in her camper - and she brought her pet cat along. Very bad move; she was caught within two hours, the cat promptly removed and taken to a vet, where it was euthanized. They've also billed her for the costs of disinfecting her camper.
One need only look at Florida to see why bringing in alien species is not tolerated in Iceland.