Frank Lewis, 18, cut the cats’ legs to slow them.
A court heard he stole ten cats. Three were found dead and another three are missing.
Prosecutor Georgina Buckley said: “He used the cats for sport.”
Sanctuary owner Theresa Ahmed called Lewis “pure evil”.
Georgina Buckley, prosecuting, said: “Lewis essentially used the cats for sport. He used his dogs to hunt down and kill them.
“He caused lacerations to the cats himself to try and hinder their escape.”
He admitted burglary and criminal damage at Swansea Crown Court.
Judge Hopkins said: “You tortured a sheep before beheading it, and then took a photo such was your satisfaction at what had been done.
“You then broke into a cat sanctuary and stole 10 cats. You used them as bait for your dogs.
“They are acts of great cruelty amounting to sadism.”
Lewis, of Croeserw, near Port Talbot, was sentenced to 30 months in a young offenders’ institute.
His 15-year-old accomplice, who was found not to have taken part in the killing of the cats, was given a nine month curfew order earlier this month.
FRANK LEWIS AND HIS FRIENDS HAVE THE TRADEMARKS OF A SERIAL KILLER:
According to pet-abuse.com, animal abusers are five times more likely to commit violent crimes than non-abusers and violent childhood and adolescent offenders against animals are likely to repeat the criminal behavior as they become adults. Studies have shown that most serial killers tortured animals as children.
(The Sun - Jan 23, 2017)