For the given sentence, find its subject.
The dog chased the cat.
The subject of the sentence 'The dog chased the cat' is 'The dog'.
Complete the following task based on the instruction and optional input provided.### Instruction:
For the given sentence, find its subject.

### Input:
The dog chased the cat.

### Output:
The subject of the sentence 'The dog chased the cat' is 'The dog'.