Abstract: A system and method to control the variation of an animal's mass, such as for example a horse. The system comprises a data collection and identification terminal having a scale, at least one temperature sensing device and a camera; a microcomputer electronically connected to the terminal; and a radio-frequency identification system. According to the method, an animal is introduced to the terminal where it is identified via the radio-frequency identification system and weighed. A visual image of the animal is taken and the temperature of the animal is measured. The visual image and data concerning the weight and temperature are transmitted to the microcomputer. The data and visual image can additionally be visually displayed and printed at the terminal. The data and image are further transmitted to an electronic database where they can be remotely accessed and evaluated in order to control the training regimen of the animal.