Maryland Code, Criminal Law § 10-616

(1) where dogs are kept or bred solely for medical or related research or laboratory tests;

(2) operated by a licensed and regularly practicing veterinarian; or

(3) where hunting dogs are housed, if the buying, selling, trading, or breeding is incidental to the main purposes of housing, keeping, and using dogs.

(b)(1) To determine if dogs are being treated inhumanely in violation of this subtitle or other law, an authorized director of a humane society, accompanied by a sheriff or a deputy sheriff, may inspect a premises:

(2) A person who inspects premises under paragraph (1) of this subsection shall give prior written notice of the time and date of the inspection to the owner or occupant of the premises.

(c)(1) In Baltimore City, the Baltimore City Health Department shall enforce this section.

(2) In Baltimore County, the Baltimore County Department of Health, Division of Animal Control or an organization that the Baltimore County government approves shall enforce this section.