An animal welfare organisation believes a dog fighting ring is behind a rise in the number of dogs going missing, but the SPCA doubts that's the case.
Chad Laboyrie hopes his seven-month-old American Bulldog, Billy, hasn't suffered such a fate, after she was taken from his home in Ohaupo, near Te Awamutu, four weeks ago.
Mr Laboyrie said he believed Billy was stolen to be used for breeding, as she wasn't fixed, but said he was extremely worried about how she was being treated.
Mr Laboyrie said he had set up the Facebook page Bring Billy Back, which had received more than 3000 likes.
He and his partner, Margot, shared photos of Billy in the hope that if more people knew about her, she was more likely to be returned.