9 C.F.R. § 2.130 Minimum age requirements.
Title 9 - Animals and Animal Products
No dog or cat shall be delivered by any person to any carrier or intermediate handler for transportation, in commerce, or shall be transported in commerce by any person, except to a registered research facility, unless such dog or cat is at least eight (8) weeks of age and has been weaned.
Title 9: Animals and Animal Products
PART 2—REGULATIONS
Subpart I—Miscellaneous
§ 2.130 Minimum age requirements.