“Dog ate my homework“ is just a classic lame excuse usually made by students explaining their failure to hand in their homework or assignment on time, and they expect the teacher to believe it.
The claim of dogs eating their homework probably came from the dogs’ behavior. They are known to eat or chew on things, such as bunches of paper or shoes.
So students, the next time you want to make an excuse, try something else because I don’t buy this one. 😀