The German shepherd puppies have now been taken into the care of the DSPCA
Revenue officers have taken custody of three puppies and an adult dog at Dublin Port.
Earlier today, a UK national was stopped and questioned at the port earlier.
He was travelling from the UK, and did not have pet passports for the dogs.
The German shepherd puppies were also not microchipped.
They have now been taken into the care of the DSPCA, and are receiving veterinary attention.
A follow-up investigation is ongoing.