Stegosaurus had triangular plates on its back, resembling armor. Its spiked tail was called "thagomizer" after Gary Larson. It weighed about 4 tons and had a brain size of a walnut. It swallowed small rocks (gastroliths) to aid in digestion
Dog anatomy varies greatly between breeds due to height and weight. Smallest known dog was Yorkshire Terrier at 6.3 cm shoulder height. Heaviest dog was English Mastiff Zorba weighing 314 pounds. Tallest known dog is Great Dane at 106.7 cm shoulder height