I love this game, the first time I also tried to give the bicuits to the dog and use the leash even though I guessed what would happen but tried anyway. The next time I tried something else and got it!
Five is my rating. I love it. I was almost ready to give up then I tried one more thing and surprise, I found the key! looks like you may have some trouble but it is good anyway. Thanks. for future players, try everything and I mean everything.