Read the following text and identify which grammar rules were violated.
I saw two dog and a cat.
The plural form of the noun "dog" must be used to match to the quantity mentioned, so it should be "dogs." Aside from that, there are no other grammar rule violations in the sentence.

Correct sentence: "I saw two dogs and a cat."
Complete the following task based on the instruction and optional input provided.### Instruction:
Read the following text and identify which grammar rules were violated.

### Input:
I saw two dog and a cat.

### Output:
The plural form of the noun "dog" must be used to match to the quantity mentioned, so it should be "dogs." Aside from that, there are no other grammar rule violations in the sentence.

Correct sentence: "I saw two dogs and a cat."