Concept:
The Pashupati Seal is one of the most famous seals of the Indus Valley Civilization.
It shows a seated figure surrounded by animals.
Step 1: Understand the Pashupati Seal.
The seal was found at Mohenjo-daro.
It shows a horned figure seated in a yogic posture.
This figure is often interpreted as a proto-Shiva or Pashupati figure.
Step 2: Identify the animals shown.
The animals shown around the figure include:
\[
\text{Elephant, Tiger, Rhinoceros and Buffalo}
\]
Step 3: Find the animal not depicted.
Among the given options, elephant, tiger, and rhinoceros are shown on the seal.
Cow is not shown on the Pashupati Seal.
Step 4: Final conclusion.
Therefore, the correct answer is:
\[
\boxed{\text{Cow}}
\]