I can personally reccommend The Naughty Pet Hospital.
Great place, clean, friendly and professional.
HuanChu is absolutely right about Cool Baby Dog Park, that place is HELL. Filthy, disease-ridden, only take your dog there if you HATE your dog. Evil, sick place.
Ditto the Liyuan Dog Market. Horrible, horrible place. Should be shut down and the dogs that can be saved should be saved, the rest euthanized for mercy's sake.