So these "fizzle" at spell level 8 and 9, due to the fact that Summon Nature's Ally VIII / IX don't have any animal options.
What do?
Hopefully there is some sort of correction in the final version, but I would use the idea laid out by the bear shaman. Apply either the giant or advanced templates to a creature from SNA VII for VIII and apply both for IX. Thats not official ofcourse its just what I would do.