In this animal classification reasoning question, find the odd word from the following domestic animals: Cow, Buffalo, Horse, Goat.

Introduction / Context:
This question tests your ability to classify domestic animals based on their biological characteristics. The words given are Cow, Buffalo, Horse and Goat. All four are farm animals, but one of them differs from the others in the way it digests food and in the structure of its stomach.

Given Data / Assumptions:

• Options: Cow, Buffalo, Horse, Goat.
• Cow, Buffalo and Goat are known as ruminant animals.
• Horse is a non-ruminant herbivore.
• We distinguish them based on their digestive system and feeding habits.

Concept / Approach:
Ruminant animals have a specialized stomach with multiple chambers that allow them to chew the cud. They first swallow partially chewed food, store it in the rumen and then bring it back to the mouth for further chewing. Examples include cows, buffaloes, goats and sheep. Horses, although herbivores, do not chew cud and have a different digestive structure with a single-chambered stomach and a large hindgut. By recognizing which animal is not a ruminant, we can identify the odd one out.

Step-by-Step Solution:
Step 1: Consider the Cow.The Cow is a typical ruminant with a four-chambered stomach and the habit of chewing cud.Step 2: Consider the Buffalo.The Buffalo is also a ruminant with a similar multi-chambered stomach and cud-chewing behavior.Step 3: Consider the Goat.The Goat is another ruminant, again chewing cud and having a four-chambered stomach.Step 4: Consider the Horse.The Horse is a herbivore but not a ruminant. It has a single-chambered stomach and does not chew cud. Instead, it relies on fermentation in the hindgut.Step 5: Compare the four animals.Three animals (Cow, Buffalo, Goat) are ruminants, while Horse is not.

Verification / Alternative check:
Another way to verify this is to recall how these animals eat and rest. Cows, buffaloes and goats are often seen resting and chewing cud after grazing. Horses, however, do not show cud-chewing behavior; they graze and then rely on a different digestive pattern. This behavioral difference reflects the underlying anatomical difference and confirms that Horse belongs to a separate digestive category.

Why Other Options Are Wrong:
Cow: A classic ruminant with a four-chambered stomach, consistent with Buffalo and Goat.
Buffalo: Another ruminant animal and therefore not the odd one when compared with Cow and Goat.
Goat: Also a ruminant, sharing the same digestive and feeding pattern as Cow and Buffalo.

Common Pitfalls:
Some learners may look for differences in size or domestic use, such as thinking Goat is different because it is smaller. However, reasoning questions typically depend on scientific or structural differences rather than simple size. Here, the digestive system and cud-chewing behavior are the relevant features that distinguish the Horse from the other three animals.

Final Answer:
The odd word out is Horse, because Cow, Buffalo and Goat are ruminant animals, while Horse is a non-ruminant herbivore.