What is the difference between Chinese foo dog statues watching and north / south?

I want to buy foo dog statues for my house (http://bostonist.com/attachments/boston_caroline/101107-fu-dog.jpg) but what is the difference between those who look ahead and looking north and south?

An imperial guardian lion, also known as Fu Lion, Foo powerful mythic protective powers that have traditionally stood in front of Chinese imperial palaces, temples, emperors' tombs, government offices and the homes of the government officials and wealthy from the Han Dynasty (206 BC-220 AD), until the end of the empire in 1911. The lions are generally present in pairs, with the female on the left and the male on the right. The male lion has his right paw on a ball, which represents the "flower of life" Woman is essentially identical, but have a puppy only in the left leg. Symbolically, the female fu dog protects the interior of the houses, while the male guards the structure. Sometimes the woman's mouth closed and the open men. This symbolizes the enunciation of the sacred word "om". However, the Japanese adaptations state that the male is inhaling, representing life, while the female exhales, representing death. Other styles that both lions with a single large pearl in each of his mouth partially open. The pearl is carved so that can be rolled into the lion's mouth but sized large enough to never be removed. There are several styles of guardian lions Imperial reflect influences from different time periods, imperial dynasties, and regions of China. These styles vary in their details and decorative arts, and as in the representation of the lions from fierce to serene.

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Why the Foo Dogs (FuDogs) using a bell?

I have tried to investigate, but all I ever find is that the information on the origin and the meaning and significance of the ball and the puppy, but not in the bell around their necks, Someone please help me in this mystery.

I apologize, I'm too lazy to Google right now, but I know that the bells are hung everywhere – Well, not always the bells, but you know … any type of [metal] objects which Ding – in Chinese culture on the alert for when a ghost / spirit 's presence. to have 2 purposes: 1. let you know that a spirit of provenance, 2. of its [magic] pursues the sound of the spirit away. put it near the symbol of dogs as guardians and solved the puzzle.

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