17" Chain with 2" Extender & Pendant (.6" x .6") Studies suggest that domestication happened around 27,000 to 40,000 years ago. By then, no other animal lived and interacted with humans. It all started when wolves began appearing near human settlements in search of food scraps. In return, they assisted humans with hunting. Over the next millennia, the wolf gradually evolved into the modern dog as we know it today. Seventy percent of people sign their dog's name on their holiday cards. Dogs may not look like us, but they are more similar to humans than we often realize. They are social beings, consider us part of their family, crave attention, and experience emotions similar to our own. These traits help explain why dogs and humans form such a strong and enduring bond. One of the reasons dogs make wonderful companions is their ability to read human emotions. They use their senses of sight and hearing to interpret their owner's emotional state. According to the AKC, dogs can recognize six primary emotions: anger, sadness, surprise, fear, happiness, and disgust. Note: Please allow 1-3 mm error due to manual measurement and 1-3g weight variation. Please ensure this is acceptable before ordering. Due to lighting conditions during photography and differences in monitor displays, the actual color of the item may vary slightly from the images shown. Please confirm this is acceptable before placing your order.