Dang DR.
However, remember that Kuma does get a free trip attempt when he hits with a bite attack. It's 1d20+1, with an extra +4 because the mephit is one size category smaller than him, which is opposed by the mephit's strength check: 12 vs. 7, so the wolf wins again.What happens to the wolf that I am summoning if the mephit moves into the square that I'm trying to summon into?
What I can't figure out is if a successful trip attempt as part of an AoO provoked by attempting to stand up, prevents the target from standing up. Logically you'd think yes; it's hard to stand up with your leg in a wolf's jaws. But AoOs are resolved before the action that provokes them is resolved. (e.g. an AoO can prevent a spell from being cast, by forcing a concentration check.) Thus, at the time of the AoO, the mephit is already prone, and tripping it has no effect, and after the AoO, the standing up action takes place as usual and the mephit can stand. Reading the rules closely would seem to suggest that the mephit successfully stands, but that seems very strange. I'm inclined to lean toward the close, non-intuitive reading in this case, purely because it means I won't have to retcon. Anyone have any more light to shed on this?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.