Scarey!
"Also...I found where he was chewing and I don't think my apartment is going to give me my deposit back when I moved out."
Can you not fix it? I remember WAY back my dad(long story involving brain injury and voices) put many holes in the walls. After the episodes would pass he/mom would get patches and fix them and then paint over. The texture was weird(as we had diffrent textured walls) but the whole was no longer there). It should not cost much if it is not a HUGE places. Not sure how you would do corners though.