We have three Long Haired Chihuahuas. In order they are 6 lbs, 5 lbs and 3 1/2 lbs.
The littlest one we call Cujo and Jeykl. She will be sitting next to you on the couch and loving the fact that you are petting her one second and then try to bite you the next second.
And the following second the little fluff ball would be leaving the toe of my boot and flying across the room!!