D.C. Mun. Regs. tit. 11, r. 11-737
A pet shop may be permitted as a special exception if approved by the Board of Zoning Adjustment under § 3104, subject to the requirements of this section.
The pet shop shall be located and designed to create no objectionable condition to adjacent properties resulting from animal noise, odor, or waste, including residential units located in the same building as the use.
The use shall not be located within twenty-five feet (25 ft.) of a lot within a Residence District. The twenty-five feet (25 ft.) shall be measured to include any space on the lot or within the building not used by the pet shop and any portion of a street or alley that separated the use from a lot within a Residence District. Shared facilities that are not under the sole control of the pet shop, such as hallways and trash rooms shall not be considered as part of the pet shop use.
External yards or other external facilities for the keeping of animals shall not be permitted.
The Board of Zoning Adjustment may impose additional requirements as it deems necessary to protect adjacent or nearby properties.
D.C. Mun. Regs. tit. 11, r. 11-737