The invention discloses a light up buckle for use with a dog collar. This buckle design comprises a Plastic Computer Board (PCB) which incorporates LED's, a mini-USB port, a switch and a rechargeable battery. The lithium-ion battery is housed within the buckle assembly and is protected from water by means of rubber seals when the buckle is in the closed or locked position.The main components are molded from translucent plastic, to allow the LED's to illuminate the assembly when switched on. There are multiple settings for the LED's to allow for a steady illumination or various flashing/pulsing settings. The buckle is intended for illumination at night to aid the visibility of an owner's canine that wears the buckle on the collar.The buckle can be fitted onto a collar strap or body harness and so has multiple uses and applications.The buckle design is rounded and has smooth edges to ensure no discomfort is experienced by the canine. There is a trigger switch located on the underside of the buckle which is operated by pressing a rubber button that protrudes from the plastic casing.The entire assembly is water-resistant, by means of two rubber components that interlock when the buckle is closed. The pressure between these two rubber plugs ensures water cannot get access to the electronics and battery.