Ha- lock my keys in the car way too often, and really do not have a good excuse like you did.
I do have a great story about this though. A friend that I was working with realized one afternoon that she couldnt find her keys at work, we looked every where. Well what had happened was that when she came back to work after lunch, she just got out of the car and walked into the building and forgot to turn off the car or lock the doors. It was cold that day and she had turned up the heater on full, so when she went to her car to see if the keys were in the car, she was in shock- it was running, then she opened the door and got hit with a blast of hot air. To top it off she had almost run it out of gas.
So you see, she didnt even have the excuse of a big dog, just work.