A smart collar includes a main body, a power module, an image capturing module, a sensing module, a process-storage module, and a wireless transmitting module. The power module includes a power control unit and a battery. The image capturing module retrieves at least one image data. The sensing module includes at least one sensor for detecting the physical condition, motion condition and environment condition of the user so as to obtain physical condition data, motion condition data and environment condition data. The process-storage module includes at least one processing unit and at least one memory unit. The processing unit generates the user condition data according to the physical condition data, the motion condition data and the environment condition data. The memory unit stores the image data and the user condition data. The wireless transmitting module transmits the image data and the user condition data to a peripheral device.
