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

### Instruction:
 在宠物店里，有7只小狗和6只小猫出售。已经卖出了两只小狗和三只小猫。宠物店还剩下多少只宠物？


### Response:
 有7 + 6 = <<7+6=13>>13只宠物。
已经卖出了2 + 3 = <<2+3=5>>5只宠物。
卖出后，宠物店还剩下13只 - 5只 = <<13-5=8>>8只宠物。