Minimum age requirements.
CFR · 2024-01-01 · US · Title 9
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.
official document · source cfr-2024 · id 9:§ 2.130