The Yorkshire Terrier is one of the smallest dog breed of terrier type, and of any dog breed. The breed developed during the 19th century in Yorkshire, England. Huddersfield Ben was a famous dog. His portrait was painted by George Earl and in 1891 an authority on the breed wrote, 'Huddersfield Ben was the best stud dog of his breed during his lifetime, and one of the most remarkable dogs of any pet breed that ever lived; and most of the show specimens of the present day have one or more crosses of his blood in their pedigree.' Factors such as stress, fatigue, a cold environment, poor nutrition, and a change in diet or feeding schedule may bring on hypoglycaemia. Low blood sugar can also be the result of a bacterial infection, parasite or portosystemic liver shunt. Hypoglycaemia causes the puppy to become drowsy, listless (glassy-eyed), shaky, uncoordinated, since the brain relies on sugar to function.
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