I have always encouraged the grand kids to be philosophical when dealing with life & life's challenges. When they asked for dog, I was not in favor of the idea; but to be fair, I made them a proposition. If they can come up with an irrefutable reason we should get a dog, I will allow it. It had to be concrete, nothing cosmic, like, we'll be sad without a dog. Had to be something I could physically visualize. I tell them to discuss it and present their case. They go into the next room & sit down. 20 minutes later I hear giggling. They head back. The little one is the ambassador. He approaches & speaks. We need a dog because there is no dog poop in the yard. You asked for something irrefutable. A clever child will immediately grasp the fundamental nature of knowledge. I got them the dog.