
Hi
No, dogs don't need pet passport or anything else to come into Ireland.
Ferry crossings...well, I guess that depends on where you live and where in Ireland you intend to visit :) There are fast crossings between Stranrear or Cairnryan & Belfast and also between Holyhead and Dun Laoghaire (nr. Dublin). These crossings are under 2 hours so perfectly feasible to leave dogs in the car. Some ferries do have on board kennels as well.