Dogs Article at wikipedia

Chihuahuas have a long life expectancy—as much as 17 years—but they have a tendency to develop health problems like hypoglycemia, joint ailments, eye infections and bronchitis. Some people believe that Chihuahuas are one-person dogs and therefore not suitable for families. In truth, they may not be suitable for a small child—since they would not tolerate teasing or random play.

Dachshunds are proud and bold. With proper attention, positive reinforcement and training, they will surprise you with a lovable and dependable temperament. A breed dating back to at least the Middle Ages, Dachshunds—coming from the German dach, which means “badger,” and hund, which means “dog”.

Jack Russell Terriers get along fine with the whole family, but young children should be taught not to tease or hurt them. A healthy Jack Russell can live as long as 15 years. Jack Russell Terriers have a fierce, headstrong independence and need special attention to maintain an even keel.

Cocker Spaniels need daily grooming—washing and brushing—to keep their lovely coats in shape. Also, clean their ears regularly to prevent infection. A healthy Cocker Spaniel can live as long as 15 years. American Cocker Spaniels differ so much from the English variety that they are now considered a separate breed.

Great Danes combine robust strength with a refined dignity. In the home and around the yard, you’ll find them uniquely gifted. Brave and loyal, they make great watchdogs in spite of the fact that they don’t bark very much.

You don't always need to buy the most expensive dog food but a finicky eater can be underweight or even overweight because of the goodies his owner tempts him with. An underweight dog can have trouble with his bone density, and his kidneys and liver and are more prone to skin infections. An overweight dog can have heart trouble and joint trouble.