Age is merely a number and there are some older drivers who have experienced little if any physical diminishment. Still, for many, the march of time brings with it ailments and conditions that can make driving uncomfortable and downright dangerous. Fortunately, today's automobiles are available with a host of features designed to help compensate for many of the physical changes that can come with aging.
Both British and American breed standards state that a Chihuahua must not weigh more than six pounds for conformation. However, the British standard also states that a weight of two to four pounds is preferred and that if two dogs are equally good in type, the more diminutive one is preferred.
Studies reveal that among all mammals, domestic dogs show the greatest range of body size among its different breeds. For example: The smallest dog breed- the Chihuahua can weigh as low as 3.3 lb (with most members of the breed weighing between 3.3 lb and 6.6 lb). The height of Chihuahuas usually ranges between 6 and 10 inches though some grow as tall as 12 inches or even 15 inches. The largest dog breed, the Great Dane, weighs over 100 lbs and a male Great Dane can weigh even up to 200 lbs. The heights of the dogs of the breed can range between 28 and 42 inches! Broadly speaking, dog breeds are classified into 3 varieties on the basis of their size.