Every dealer, agent and hauler shall keep such accounts, records and memoranda as are determined by the department to be sufficient to identify all living or dead domestic animals handled and their origin and disposition to fully and clearly disclose all transactions involved in his business, including the true ownership of such business by stockholders or otherwise. Every dealer, agent and hauler shall also keep records of such health certifications and sanitary measures as are required under the provisions of this chapter or its regulations. The department may investigate the records of any applicant or licensee under this subchapter. The applicant or licensee shall provide its records upon the department's request. Information unrelated to the purpose of the investigation and relating to the general business of the applicant or licensee shall be deemed to be of confidential nature by the department. The department shall conduct such inspections as are necessary to assure the sanitary and humane handling of domestic animals.