Helium also "leaks" thru the surface of the balloon much faster because of the increased surface area. So it shrinks quickly. The weight of the balloon makes it difficult to get the volume needed to offset that. I have played with them and tried inflating them with helium to decorate for my own kids party years ago. They look nice for about 10 min. and like Jolly Well said...they didn't really float on their own. And that was fully inflated. By the time you twist them (giving you even less room for the helium) you just have an increadable shrinking dog who sits on the ground. It would be a sad little sight.
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