HONOLULU -- Derrick Silva told KITV he never attended veterinarian school or received any medical training.

Silva also said he conducts procedures on animals at his Pearl City home, including spaying and neutering dogs and performing eye surgery.

Silva says he doesn't have a veterinarian's license.

Jo Ann Uchida says her office, which regulates veterinarians, has never received any complaints against Silva.

"Anytime somebody is doing surgery on an animal, they need to have a license and certainly if they are doing ear cropping," said Uchida.

Uchida said there are no reported complaints against Silva.

Uchida is encouraging the public to contact the state's Department of Commerce and Consumer Affair's complaints and enforcement office.

If Silva violated Hawaii's licensing law, he could face civil fines and or criminal charges.

The Hawaiian Humane Society says it is also investigating.

"We are offering a $2,000 reward for any tips or information leading up to the arrest and conviction of animal cruelty," said Keoni Vaughn of the Hawaiian Humane Society.

The Humane Society says if it can confirm Silva has done animal surgery it will refer the case to the city's prosecutors office.

Under Hawaii's animal cruelty law there are exceptions for "accepted veterinary practices" and for ear "cropping".

Prosecutors will determine whether what Silva was doing fits those exceptions before proceeding with criminal charges.