Wait a minute, I think everyone here should be able to "feel" their yorkie's ribs if you rub across them. As long as you don't see them you are fine. If she's behaving normally and just had a dewormer then she is fine. I usually take up for husbands because I am one but yes, he may be slight bit crazy on this one
If it would ease your mind though go to the vet but it doesn't sound like you need to.