A child first labels the household pet cat as a "cat" and then generalizes this label to other animals that look like it.

孩子先把家养的宠物猫称为“猫”，然后把这个称呼扩大到其他看起来像猫的动物。

《柯林斯英汉双解大词典》

My pet cat disappeared.

我的宠物猫失踪了。

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I have a lovely pet cat.

我有一只可爱的宠物猫。

youdao

By selecting Pet-cat or Pet-dog modes, the camera will automatically detect cats or dogs and focus on their faces.

ENGADGET: Olympus introduces Stylus SP-820UZ, SP-720UZ cameras and SZ-14 binocular bundle

Marvel at the pet accessory ads that pollute the cat-and-dog newsgroups.

ECONOMIST: Hard sell

In fact, the resulting tube-like structure was but the overture to a major symphony of cat-related outdoor enclosures, a veritable pet Disneyland, if you will.

WSJ: Cat-Product Entrepreneurs Stay Steps Ahead of the Copycats