Which of the following does not yield wool?

Options

A. Yak
B. Camel
C. Goat
D. dog

Answer

To determine which of the following does not yield wool, we need to analyze the options provided: yak, camel, goat, and wooly dog.

### Step-by-Step Solution:

1. **Identify the Sources of Wool**:
- Wool is primarily obtained from sheep. However, there are other animals that also produce wool or wool-like fibers.

2. **Examine Each Option**:
- **Yak**: Yaks produce a type of wool known as yak wool, which is soft and warm.
- **Camel**: Camels produce a fiber called camel hair, which is also used in textiles.
- **Goat**: Certain breeds of goats, such as the Angora goat and Cashmere goat, produce wool-like fibers (Angora wool and Cashmere).
- **Wooly Dog**: While some dogs have thick fur, they do not produce wool. The fur of dogs is not classified as wool.

3. **Conclusion**:
- Among the given options, the wooly dog is the only one that does not yield wool. Therefore, the correct answer is the wooly dog.

### Final Answer:
The option that does not yield wool is **wooly dog** (Option 4).

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