A ROOFER who sold a dog which killed a Caerphilly schoolboy insists he is not to blame for the tragedy.

Lee Jenkins, 34, said in an online advertisement he was selling the animal because it "does not like other dogs", but that it was great with people

However, the powerful eight-stone dog attacked schoolboy Jack Lis, 10, as he visited his friend's home.

A woman, 28, who took the 15-month-old dog has been arrested - and Mr Jenkins is one of two men to be interviewed by police over the attack.

He said: "I am not the owner of that dog.

"I told the police everything I know. They know I have nothing to do with it.

"It's not my dog and it's since been re-homed from me."

His advertisement for the animal was posted on Facebook on October 29, claiming it was "grate [sic] with people".

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The post said the American pitbull-style animal was 15-months-old but "unfortunately does not like other dogs".

It said: "I've tried my best with him, I have other dogs and can not put them at risk.

"He needs someone with time."

The post described the dog as "height 24ttw - about the same as a labrador - and weighing 115lbs".

The dog was taken in by the family of one of Jack's friends.

He was killed by the dog in Penyrheol, Caerphilly, on Monday afternoon after calling in after school.

The dog was shot seven times by armed police officers following the attack.

Police say a dog legislation expert has now been brought in to examine its features to see if it is a breed allowed in the UK.

Tests could be carried out to check the animal's DNA along with its owners and breeders being quizzed by officers.

Chief Superintendent Mark Hobrough said experts will "look at the character traits of the dog" to see if it is a banned breed.

He said: "We are looking at all potential offences and all potential actions that need to come as a result of this investigation."

The dog had previously been spotted aggressively growling at passers-by while pulling on its owner's leads.

Wayne David, the Labour MP for Caerphilly, said: "There needs to be an examination of the Dangerous Dogs Act to see if the law needs to be strengthened."

"Lessons must be learned," he said.

Three people have been questioned by detectives investigating the death.

A 28-year-old woman from Caerphilly was held on suspicion of being in charge of a dog dangerously out of control causing injury resulting in death.

She was later released on conditional bail.

Two men – Jenkins, of Mountain Ash, South Wales, and a 19-year-old from the Caerphilly area – voluntarily attended a police station and were also quizzed on suspicion of the same offence before being release.