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”.

Don’t be surprised by the small size: Jack Russell Terriers can be a handful. Jack Russell Terriers have a fierce, headstrong independence and need special attention to maintain an even keel. For this reason, some experts recommend that only experienced dog handlers should have one.

Cocker Spaniels are amazingly adaptable. If you’re an active hiker, these dogs will keep pace with you all the livelong day. Though largely bred to be a live-in companion, Cocker Spaniels still retain the genes of their hunting ancestors, making them equally sporty and cuddly.

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.