Read specific rules for each island. Follow rules to the letter.
Otherwise? You roll the dice. Maybe the nice man says "Doan worry, you just keep 'im on
boat." or maybe the nice man says "Doan worry, it just ninety days in quarantine" and when you get the bill, it will seem like that quarantine was a Hilton.
That hasn't changed in three years. Read the rules, roll the dice. Skip the places that will be problematic. If the dog jumps over the side for a swim and winds up ashore....Ooops, the Hilton.