Find the odd animal (beast of burden vs common pet): Select the option that is not typically used as a draught/pack animal.

Introduction / Context:
Human–animal roles provide a robust basis for classification. Many domesticated species are historically used for transport, ploughing, and hauling (draught/pack animals). Others are chiefly kept as pets/companions and are not employed for traction. This role difference isolates the outlier clearly.

Given Data / Assumptions:

• Camel: pack/draught animal, especially in arid regions.
• Horse: classic riding and draught animal.
• Ox: castrated adult male cattle used widely as draught power.
• Cat: household pet; not used for traction or load-carrying.

Concept / Approach:
Group items by primary traditional human use: draught/pack capability vs companionship. The first three are work animals; the cat is primarily a companion/pest-control animal, not suited or used for pulling or carrying loads.

Step-by-Step Solution:

Verification / Alternative check:
Historical records and husbandry practices universally document horses, camels, and oxen as traction. No such tradition exists for cats.

Why Other Options Are Wrong:
They share the “working animal for traction/transport” role.

Common Pitfalls:
Do not confuse occasional pest control by cats with draught/pack functionality; these are different roles.

Final Answer:
Cat