Jill Adams, who lives at Turnberry Green, heard a massive crash around 4.15 in the morning and ran out to find that a breeze block had been thrown through the cattery roof, seriously injuring her 14-month-old Exotic Persian, Clodagh.
The cat - a Garfield lookalike - died two days later despite intensive veterinary treatment. Mrs Adams' other Persian, Jack, was unhurt but very frightened.
Mrs Adams, a member of Erin Cat Club, said both she and the rest of her family were devastated by what had happened. "I don't understand why or how somebody could do this to an animal," she said. "It's sheer cruelty."
"When I ran outside, Clodagh's leg was half off and her stomach was hanging out. There was blood everywhere. I was screaming for my husband to get the vet and call the police and it was just pandemonium."
A vet arrived and gave the cat emergency treatment, and police also attended as well.
Said Mrs Adams, "The vet phoned to say that her hip was broken in several places and the muscle had been severed in half. They stitched her up and gave her antibiotics and at first we thought she was going to be okay, even though she was weak."

However, on Monday afternoon Mrs Adams received a call to say that her cat had died.
She added, "I had to pick my daughter up from school, on her 14th birthday, and tell her that Clodagh had died. She was in tears, I was in tears and her 11-year-old sister was in tears as well.
"What we have been through from the early hours of Saturday morning has been a nightmare. I am very upset and very angry as well that someone should do this."
The Adams had owned Clodagh, valued at £600, since she was a kitten and Mrs Adams had planned to show her in September. Just three weeks ago she had bred her with Jack, bought at the same time as Clodagh, in the hope of producing kittens.
Said Mrs Adams, "She was a real part of our family. We had T-shirts and everything with her on them. Everyone in the vet's was fantastic and I could tell they were really upset too when she died. They couldn't have done any more."
As well as the emotional upset, the Adams will have to pay a veterinary bill of several hundred pounds as a result of the attack.
A police spokesman confirmed that an incident of criminal damage at Turnberry Green was reported to them shortly before 4.24am on Saturday morning and that enquiries into the incident are ongoing.
DUP councillor Robert Smith, who spoke to Mrs Adams after the incident, said, "I know this lady very well and her cat was very precious to her. What took place was a criminal offence and whoever did it should not get away with it. If they did this to one animal they are capable of doing it to another.
"I hope the police will investigate this incident fully."