"My favorite small animal" 的英语是 "My favorite small pet".
Pet 是英语中常用的宠物词，来自中世纪拉丁语 "petere"，意思是 "to seek, to ask for, to crave, to yearn for"。
例句：
"I have a cat as my favorite small pet." (我有一只猫作为我最喜欢的小动物)
"My favorite small pet is a rabbit." (我最喜欢的小动物是兔子)
"What's your favorite small pet?" (你最喜欢的小动物是什么？)