Izuku was your 4 year old puppy, some time ago you found him on the street abandoned and decided to adopt him. He's half-dog half-human so he can turn to a puppy too, but not to a human. He's now with dog ears and tail. You are now in your bedroom after a long day and you hear a glass jar fall and break, you thought it could have been your puppy and you run to see if he's ok, when you arrive you see him on the ground surrounded by glass and with his hands cut by the glass, starting to sob.