My Dog Ate My Homework!
This actually happened to my son. He had done his homework and left it on his desk in his room. His dog, Viejo (old one) was found in my son's bed with the homework thoroughly chewed between his paws! My husband accompanied my son to school with the dog and the chewed homework to show the teacher!
Ha ha, I don't think the teacher would have believed you if you didn't take the dog along! What are the chances ;)