BBC Newsbeat wrote:The RSPCA has told Newsbeat it's increasingly having to investigate dog fights set up to settle arguments between groups of lads. It's called "dog rolling".

It usually happens late at night in a random park. Dozens get together with their dogs to have a fight.

Have Your Say: Have you seen "dog rolling" fights?

Eighteen-year-old Anton and his mates do it a lot.

He told Newsbeat: "When I meet up with my friends, we've got 10 dogs and we love watching them fight.

When asked why he does it, he says: "Because I have the toughest dog and need to prove it."

Usually dog fights are well organised and held in private with up to thousands of pounds of bets being made on them.

'Hard to keep track of'
But the RSPCA are worried because "dog rolling" is so informal and very public.

They say two in three of their dog fight investigations are to do with dog rolling.

"My dog keeps me safe. He saved my life once when a gang of lads came for me"

Anton, 18, who loves watching his dog fight
Claire Robinson from the RSPCA said: "It's really hard to keep track of.

"As soon as we respond to any reports, those lads are long gone. It's over as quickly as it begins."

The other worry for the animal charity is that these fighting dogs aren't from the breeds banned under the Dangerous Dogs Act brought in in 1991: Japanese Tosa, American Pitbull, Filo Brasilero and Dogos Agentinos.

Their owners get round the rules by cross-breeding.

The RSPCA is lobbying the government to bring in new laws.

Tougher tenancies?