D.C. Mun. Regs. tit. 25, r. 25-D823
Patrol dogs accompanying police or security officers and sentry dogs running loose in outside fenced areas or service animals providing assistance to individuals with physical handicaps may be allowed in a massage establishment or health spa facility if the presences of the animals do not result in contamination of the massage establishment or health spa facility's equipment, devices, fixtures, linens, furnishings, garments, or other supplies.
Dogs, cats, birds, or other animals shall not be permitted in a massage establishment or health spa facility, except as provided in section 823.1.
Fish, in an aquarium, may be allowed in a massage establishment or health spa facility if the aquarium is maintained in a sanitary condition.
D.C. Mun. Regs. tit. 25, r. 25-D823