19 C.F.R. § 123.27 Feeding and watering animals in Canada.
Title 19 - Customs Duties
If animals in sealed conveyances or compartments cannot be fed and watered in Canada without breaking customs seals, the seals shall be broken and the animals fed and watered under the supervision of a United States or Canadian Customs officer. The supervising officer shall reseal the conveyance or compartment, and make notation as to the resealing on the manifest.
Title 19: Customs Duties
PART 123—CUSTOMS RELATIONS WITH CANADA AND MEXICO
Subpart C—Shipments in Transit Through Canada or Mexico
§ 123.27 Feeding and watering animals in Canada.