The Seven Ages of Your Dog: A Complete Guide to Understanding and Caring for Your Dog, from Puppyhood to Old AgeDo our dogs experience the equivalent of infancy and puberty? Do they go through terrible teens or struggle with mid life crises? And what can we do to ensure they take each step in their stride? International best selling author Jan Fennell leads us through the key stages of a dog's development by defining the seven ages of man's best friend. All owners know their dogs pass through distinct, often dramatic phases during their life. But what are those