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

### Instruction:
 一只猫有九条命。一只狗比一只猫少三条命。一只老鼠比一只狗多七条命。一只老鼠有多少条命？


### Response:
 狗：9-3=<<9-3=6>>6 条命
老鼠：6+7=13 条命