This for The Republic of Ireland:
Eire
Vistors to the Eire who intend to stay for less than thirty days are not required to get a dog licenec those who stay over thirty days are. In addition, there are a number of breeds that are required to be under strict control in the Republic of Ireland. These are Bandogs, American Pit Bull Terriers, Bulldogs, Bull Mastiffs, Doberman Pinschers, English Bull Terriers, German Shepherd (Alsatians), Japanese Akitas, Japanese Tosas, Rhodesian Ridgeback, Rottweilers and Staffordshire Bull Terriers including any other strain or cross or every breed or type of dog so described.
It is necessary to have these dogs controlled by a sufficiently strong chain or leash not more than one metre in length and by a person over the age of 16 years of age who is capable of controlling the dog.
Further, these dogs must be muzzled while in a public place. These dogs must also have collars which identify the dog and give an address. With thanks to the ISPCA for this information link to site.