A ban on breeding, importing or re-selling XL Bully dogs is now in effect.
The changes which came into effect at midnight are part of a series of measures announced after a number of serious attacks on people in recent years.
The ban comes in two stages with the first beginning today, October 1st and a full ownership ban due to come into on February 1st, 2025.
The period between these two dates will allow current XL Bully owners time to apply for a 'Certificate of Exemption' from their local authority to permit them to keep their dog until the end of its natural life.
There is no fee for the Certificate of Exemption.
Owners will be able to apply for the certificate subject to the dog being licensed, microchipped and neutered.
Existing dogs already in animal welfare charities and shelters can be rehomed or exported subject to "strict criteria until February 1st 2025".
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XL Bully type dogs are already subject to existing additional controls as a cross of restricted breeds.
When in a public place they must be securely muzzled and kept on a strong chain or leash with a maximum length of two metres by a person over 16.
Any owner found to be in breach of the regulations could face a fine of up to €2,500, imprisonment or both.
The dog may also be seized and euthanized.
The ISPCA has expressed concerns about the plan and its impact on animal welfare.
It said the change is "deeply worrying for responsible dog owners who already comply with the legislation".
In July, the ISPCA said out of a total of 211 dogs in their care currently waiting for new homes, 68 are restricted breeds with "28 potentially falling under the definition of an XL Bully."
More information on the XL Bully ban can be found here