▲你的句子涉及两个问题：

1. 涉及准并列连词 as well as的用法，严格说来 A as well as B 强调的是A，意思是“不仅B而且A”，但在许多情况下可将 as well as 大致理解为and。如：

He sells other stones as well as diamonds. 他既卖钻石，也卖其他宝石。

Robbing banks is risky as well as wrong. 抢劫银行不仅错误而且很危险。

He wrote poetry as well as fiction. 他写诗，也写小说。

Skiing requires skill as well as strength. 滑雪需要技术与体力。

2. 涉及have…as…结构，意思是“把……作为……”。如：

He had it as a bookmark. 他把它用作书签。

The man had the bench as a bed. 这个男子把长凳用作床。

We had soup as a starter, followed by steak. 我们的第一道菜是汤，接下来是牛排。

▲你的句子意思是：

She has a dog as well as two cats as pets. 她养一条狗和两只猫当宠物。