Man's Best Friend?

My idea is a Lego-built robotic dog that will act just like a real dog! It is well trained and it won't bite. Simply tell him to sit, and he will sit. Tell him to shake and he will shake a paw with you. (See the images for how the paw-shaking works.) This Lego dog also comes with a bone, which you can activate by a switch and toss it away. Say “Fetch!” and the dog will, well, fetch! (See the images for how the fetching works.) It is so simply easy! It acts just like a real dog, only no food (just batteries), no dog hair on the couch, and no endless walking in the park. And no one can be allergic to Lego bricks! It's allergy-friendly too!