A Queensland man who culled pitbull puppies to create a pack of savage canines for a national dog-fighting ring has been jailed.

Bradd Michael O'Keeffe, 41, kept more than 30 dogs chained on a remote north Queensland cattle property when RSPCA inspectors raided the property in April 2018.

A man who ran a national dog-fighting ring has been jailed (file image). Credit:RSPCA Queensland

Inspectors seized 19 pitbulls, some badly scarred and infested with worms, and one so aggressive it had to be euthanased.

Other dogs were kept in cages, including French bulldogs, pugs, dachshunds and a chihuahua.