I live near QC, but not in the side of Commonwealth area so I can't really suggest a good veterinary shop per my experience. You may check this, though. http://www.pinoypetfinder.com/quezoncity.htmlf
Maybe you can try clinics located in SM Fairview? Animal House has a branch in SM Fairview although I haven't really tried bring our pets there.
Not sure about immediate service, but we take our dog to UP Vet Med, which is right behind the College of Fine Arts