Though your dog understands the command "Fetch the ball," but he may think of the object in a very different way than you do when he hears it. As the authors explain, "Where shape matters for us, size or texture matters more for your dog. This study shows for the first time that there is a qualitative difference in word comprehension in the dog compared to word comprehension in humans."So the next time you teach your dog to associate a word with an object, consider the size a texture of the object. You wouldn't want your dog to think a ball is the same thing as an orange!