BobChuck
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Can it be taken multiple times for the same attack?
No. As written, a creature cannot take it multiple times period.
As you can see, Weapon Focus includes a note about how you may take it multiple times, and that it does not stack so you must choose a different weapon.
Improved Natural Attack includes no such note, so (like most feats) a creature may only take it one time period.
That said, I see no problems with allowing a creature to take it like Weapon Focus (more than once, but only once per natural attack). But this would be a house rule.
EDIT: hmm. It would appear that another version of the Pathfinder SRD says that my "house rule" is how the feat normally works. meh. Either way.
But just so it's clear: no, you cannot take it multiple times AND apply it to the same weapon each time. Imagine a monk doing that.