Intimate knowledge of anatomic structures associated with acupoint location provides important benefits. Two papers (Part I and Part II) review eleven commonly used canine acupuncture points and the relative anatomy associated with these acupoints. In Part 1 of the thoracic limb, the anatomy of acupoints reviewed are: LI-10, LI-11, HT-7, PC-6, and TH-5. Common anatomical structures are demonstrated with their relationship to needle placement in dogs with some comments on the cat.