Webster's Revised Unabridged Dictionary · 1913

Cargo

Cargo , noun

[Sp. cargo, carga, burden, load, from cargar to load, from cargar to load, charge, See Charge.]

The lading or freight of a ship or other vessel; the goods, merchandise, or whatever is conveyed in a vessel or boat; load; freight.
Cargoes of food or clothing. — E. Everett

The term cargo, in law, is usually applied to goods only, and not to live animals or persons.