Your dream reminded me of the really old movie, "The Mouse That Roared".

Maybe your dream was telling you that though you think of yourself as small and not very significant or with much personal power, you actually have a great deal or all you need. I am reminded, too, of the way some young women are described as being "mousy"? Maybe you think your "friends" (represented by the leg you thought belonged to one) feel this way about you and you would like/need to let them know you are not that "quiet, timid, and ineffectual"?