Dog Hoodie Sweater -Small

I bought this for my chihuahua, but it's too small. He wears a medium (which is what he is wearing in photo). I only put this sweater on once because it was too small. He is 10 lbs, so I would say this would fit a dog smaller than 10 lbs. I was able to get it on him, it just didn't look comfortable. It's brand new, only worn a few seconds to try it on. I will include the little hanger :)