Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Jason's dog has a tail that's half the length of its body, and a head that's 1/6 the length of its body. If the dog is 30 inches long overall, how long is its tail?

### Response:
The dog's body is 30-12=<<30-12=18>>18 inches long.
Its head is 18/6=<<18/6=3>>3 inches long.
Its tail is 18/2=<<18/2=9>>9 inches long.
#### 9