Who doesn't love the appeal of Shirley Temple. This little classic has long lasting appeal for the well dressed dog.
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For sizing, you should go by the size your pet is accustomed to and check the specific chart referenced above, but you may find the following a helpful guide for a quick assessment ( inches refer roughly to length measurements):
X-Small: 7" (2.5-5 lb)
Small: 9" (5-8 lb)
Medium: 10" (8-12 lb)
Large: 12" (13-20 lb)
X-Lrg: 13" (20-31 lb)