9 C.F.R. § 3.27 Facilities, outdoor.
Title 9 - Animals and Animal Products
(a) Hamsters shall not be housed in outdoor facilities. (b) Guinea pigs shall not be housed in outdoor facilities unless such facilities are located in an appropriate climate and prior approval for such outdoor housing is obtained from the Deputy Administrator.
Title 9: Animals and Animal Products
PART 3—STANDARDS
Subpart B—Specifications for the Humane Handling, Care, Treatment, and Transportation of Guinea Pigs and Hamsters
Facilities and Operating Standards
§ 3.27 Facilities, outdoor.