I have a pet dog.

我有一只宠物狗。

I have a pet bird.

我有一只宠物鸟。

I have a pet dog at home, and it is very cute.

我家有一只宠物狗，它非常可爱。

I have a dog as a pet.

我有只宠物狗.

I have a pet monkey which attempts to mock all my actions.

我养了一只猴子当宠物，它试图模仿我所有的动作。