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

### Instruction:
 哈特利有4只小狗，每只重7.5公斤。救助中心有14只猫，每只重2.5公斤。猫比小狗重多少公斤？


### Response:
 小狗 = 4 * 7.5 = <<4*7.5=30>>30 公斤
猫 = 14 * 2.5 = <<14*2.5=35>>35 公斤
35 - 30 = <<35-30=5>>5
猫比小狗重5公斤。