Answer: Don't make an excuse.
Explanation: Don't lie to your teacher and tell her "your dog ate your homework" and don't say "Your having trouble at home". Tell your teacher the truth, even if the truth is that you were lazy. Just be honest with your teacher and tell him/her that you didn't do it. Do not lie, because Karma can and most definitely will come back to you. We all the know the saying... Karma's a ….. well you get it so, DO NOT LIE. And besides, You never know what your teacher's reaction will be. Who knows maybe he/she will give you extra time to do it or turn it in.
