my mother has a Yorkie and its almost 5 pounds and I call that little compared to my 95 pound bassets, so if the floor bounces with a little dog, you have some problems.
Seems the subfloor is not properly attached to the joists and the top floor is not attached to the sub. Therefore you have a true floating flooring.
I would check out the flooring if you have a crawl space or basement to access the problem. Its just too early to state a panacea to this problem until you come back with alittle more information.
Maybe alot of toenailing with zinc screws, liquid nails, its just hard to tell on this one with that much bounce.
fly your flag.
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