What about taking pets on the ferry?
Rail/Sail to Ireland
Pets (small dog, cat or ferret) are permitted to travel with foot passengers, but they must be transported to and from the ferry in a secure, rigid and appropriate pet cage or box (please bring your own). The pet must be able to stand or lie down in the cage or box in comfort and the owner of the pet must be able to carry the cage or box from the terminal to the ship. All pets must travel on the car deck (in the kennel area) in their cages or boxes. Please note that if you turn up at the port without an appropriate pet cage or box you will not be allowed to bring your pet on board. There are no exceptions to this rule.
Brexit: Travelling after Brexit
Check the relevant authority’s websites for full details of the requirements:
Ireland: https://www.gov.ie/en/publication/b76e9-brexit-movement-of-pets/
UK: https://www.gov.uk/guidance/pet-travel-to-and-from-great-britain
Useful Links:
Ireland: https://www.agriculture.gov.ie/pets/
