Ben lives in Somerset with Zola, his wife Jordan and three children Millie, six, Oscar, five, and three-year-old Nala.
Jordan said: "The XL bully has been massively exploited for this because of how much they would sell for.
"Unlicensed breeders can have up to three litters a year. Before the ban you are looking at it being around £5,000 per XL puppy. So that is why so many people have bred them."
Ben added: "Any sort of Tom, Dick and Harry could effectively have bred them. They’re not bothered about the temperament of dogs or the right genetics, it’s money in their pocket at the end of the day."
Ben Spencer plays rugby for Bath and England
Ben has lent his voice to the campaign group Don’t Ban Me, Licence Me who are lobbying the Government to end Breed Specific Legislation.
As things stand the breed will be "banned" but dogs such as Zola will be allowed to live with their owners once they are microchipped, neutered and wear a muzzle when walking in public areas.
Jordan said the couple are keen to educate dog owners and to raise the issue of mandatory licences with the Government.
Ben added: "Everyone wants dangerous dogs off the street. I’ve been quite open because Zola’s amazing and we wouldn’t want anything to happen to her."