It depends on what characteristic you want to measure! Its mass, its height, the amount of body fat, the fineness of its fleece?
inches
Kilograms.
jolts or something
meeters?
Time
You would typically use kilograms or pounds to measure the mass of a sheep.
Feet.
a centimeter
A shoe.
You would use CM or INCHES to measure a knife
meters
inches
inches
Kilograms.
tons
Centimeters
Square footage.