The Control of Dogs Regulations 1998 specifies 10 breeds which need strict control.
• American Pit Bull Terrier
• Bull Mastiff
• English Bull Terrier
• Staffordshire Bull Terrier
• German Shepherd (Alsatian)
• Japanese Akita
• Japanese Tosa
• Rhodesian Ridgeback
• Doberman Pinscher
See below for the pictures of these breeds.
In summary, the regulations state the following:
These dogs, or strains and crosses of them, must be kept on a sufficiently strong chain or leash, not exceeding two meters in length by a person over 16 years who is capable of controlling them.
These dogs, or strains and crosses of them, must be muzzled whenever they are in a public place.
These dogs, or strains and crosses of them, must wear a collar bearing the name and address of their owner at all times.
These rules on muzzling and leashing do not apply to dogs used by the Gardaí, the Dublin Harbour Police, State Airport Police and bona fide rescue teams in rescue operations. The rules on muzzling do not apply to guide dogs for the blind.
Fines of up to €1,269.74 can be imposed for breaches of this legislation.
Link to the Control of Dogs regulation 1998
Also see following for further general information on control of dogs