What type of dog do you think is the best indoor dog?

Hi there. When I grew up, I remember my grandmother had a sidney silky or a little fluffy dog, that would've past as a cat, so did my mom, she also had the same breed... These dogs would just mainly sit in one place, they were cute back then, I have a pitbull and she would think there dogs were cats lol...

I think you would get a small one like a chihuahua but I think I depend on how small do you have that you dog be.