I don't have a pet, but in case your pet chews your homework, it's important to first assess the extent of the damage. If the damage is minor, you could try to salvage the parts that are still intact and do your best to piece things together. However, if the damage is significant and you can no longer complete the assignment, it's best to reach out to your teacher and explain what happened. You can apologize for not being able to submit your work on time and request an extension or an opportunity to make up the assignment. It's important to be honest and transparent about what happened and take responsibility for the situation.