Not sure where the phrase came from originally, but the excuse “the dog ate my homework” is currently used as a silly excuse for why work isn’t finished. It would be unusual for someone to say, “the dog ate my homework” and expect it to be taken literally. In my case, the dog really did eat my homework.
Charlie, our golden retriever/chow-chow mix, chewed up paper. He liked most paper, but had a preference for yellow legal pads and on occasion chewed up my work notes and ideas. I also like yellow legal pads and had a habit of not securing them in best places to keep them out of his reach.
Charlie was a rescue that we fostered for a week and ended up adopting. It was a good match for both of us. We were ready for a new dog, he needed a new home.
Charlie needed training desperately. He was aggressive to strangers and other dogs, and chased everything that moved. He ate or chewed everything. After working with a trainer, we discovered his aggression was fear. Eventually he was better, especially when he was around us and felt safe.
As for chasing, that got better too and he learned to walk on a leash and obey commands. For a long time, we carried a spatula smeared with liver sausage when we walked. When we saw a car, bike or scooter, we would take out the spatula and when Charlie sat and looked at us, he was allowed to lick. Eventually we were able to walk without the spatula, and used treats as incentives. He was very responsive to treats.
Because he loved to chase so much, we took him lure coursing at a local track. No one had to show him what to do, he just took off. He loved it so much. He couldn’t wait for his turn, and he would have run forever if we had let him.
Although training cured most of his bad habits, we never could stop him from chewing on paper. Even a piece of cheese and a little patience with lots of toys and attention didn’t help. I think he did understand, but just couldn’t help himself. Just like some people, he had poor impulse control.