用英语形容一只白色的小狗时，可以使用以下表达：

基本描述

- It's a white puppy.

- This is my white dog.

- She is a white canine.

特征补充

- It has two small ears and a wagging tail.

- It has bright eyes and a friendly demeanor.

- It has a soft, white coat.

情感表达

- I love it so much!

- It's my best friend.

- It brings so much joy to my life.

注意事项

"Puppy"特指幼犬，而"little dog"更适用于描述成年但体型较小的狗（如吉娃娃、博美）。- 形容词"white"应置于名词"dog"之前，符合英语语法规则。通过这些表达，可以清晰地描绘出白色小狗的外貌特征和与人的情感联系。