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
inches
meters
Kilograms.
inches
Centimeters
Kilograms.
Square footage.