Li Shenron
Legend
I agree with those who say that you shouldn't make a cohort animal in the first place. Cohorts and followers should always be intelligent beings, while animals can be of course animal companions. An awakened animal instead is perfect as a cohort.
Anyway, since you already have it, I think that if it doesn't qualify as a cohort anymore after awakening, it will became an NPC friend. He can choose to follow you or otherwise go off on his own, but you would not have the guarantees of leadership over it. At least until your leadership score becomes again high enough to reinstate the leader-cohort relationship.
If I were your DM, but if I had allowed already the original "animal as cohort" option, I'd probably come up with some friendly compromise, such as letting you awake him but NOT giving it the HD increase which would put it beyond the limit, until you have levelled up enough so that it would be fine with the extra HD as well.
Anyway, since you already have it, I think that if it doesn't qualify as a cohort anymore after awakening, it will became an NPC friend. He can choose to follow you or otherwise go off on his own, but you would not have the guarantees of leadership over it. At least until your leadership score becomes again high enough to reinstate the leader-cohort relationship.
If I were your DM, but if I had allowed already the original "animal as cohort" option, I'd probably come up with some friendly compromise, such as letting you awake him but NOT giving it the HD increase which would put it beyond the limit, until you have levelled up enough so that it would be fine with the extra HD as well.