This puppy look like great dane breed. Mayb u can walk aound your housing area to see if anyone having great dane in their house.
Btw, i lost my dog at Sri Petaling too (Jalan 3/149G), near to your area in last year, 24-Jan-2010.
http://www.petfinder.my/pets/9832/
If you happen to see this chihuahua mixed around there, please inform me. Thank you.