Dr. Lai Chong's clinic is Hand N Paws:

Hand "N" Paws
C-17G, Jalan PJU 1/45, Aman Suria Damansara, 47301 PJ
Tel: 03-78046539

There's also Dr. Mervin, and another female doctor who I think is Dr. Jenny (Who is the only attending doctor on Sundays)

Update: Hands N Paws vet recently moved. Here is the new address:

G-21, Block B, Merchant Square, Jalan Tropicana Selatan, Tropicana, 47410 Petaling Jaya, Selangor, Malaysia
Phone: +60 3-7804 6539

My 8-year old corgi has been with them for 7 years+ and they are honestly the best vets I have ever came across. Both Dr. Lai Chong and Dr. Mervin are very thorough and very detailed and will do their best to make sure your dog/cat is well-taken care of. They also seem to give discounts to people who rescue dogs/cats and bring them in for vaccinations, deworming, etc.

I also have dogs in Labuan, which has very poor government vet service (Long story). I usually refer to Dr. Lai Chong or Dr. Mervin for advice when my dogs in Labuan face problems and they will do their best to diagnose and treat from far without having seen and/or touched those dogs, and so far, it always works!

Dr. Jenny treats exotic animals here. I brought my late guinea pig (She was 7-years old when she passed 3 years ago) and now my 3-year old rabbit (It was abandoned and we took him in). She is very careful and highly recommended for exotic animals, although she is by appointment only- you need to email her to set up an appointment.