I don't know what aswang are, but I take it it has something to do with mythical creatures, folklore legends, or other para-normal type spirit world beings. The Tanuki of Japan are an interesting michievious critter who are the source of such folklore. Here's a great story:
http://modzer0.cs.uaf.edu/~logan/stories/train.html
and here's a little about them:
http://www.sonic.net/~anomaly/japan/tanuki.htm
Statues of a tanuki, either lifelike or stylized, are often displayed at the entrances to resturaunts, especially soba (buckwheat noodle) shops. They are said to lure passers-by into coming into the shop.
It's interesting how Asian mythical beasts are so different from European. Contrast the wisdom and good luck associated with an Asian dragon with the manevolence of the European one, or the mischievious humor of a tanuki with the horror of a werewolf.
- Jeff