i think it happens in the magne. but they are going to cover the last 21 chapters of the manga soon so it should be in one of those :)
inuyasha episode 128
there is no other episode but their is another series called 'inuyasha the final act'
Episode 18 of InuYasha the final Act
the inuyasha movie is not an episode
episode 100
its episode 87
Episode 79 of Inuyasha
it is episode 117
It is episode 13
Idk. Google inuyasha episode list, or/and go to tv.com episode 110
there is no other episode but their is another series called 'inuyasha the final act'
Shippo bites Inuyasha on the butt using 'Heart Scar' on episode 130