Abstract: An illuminated collar for improving night time visibility of a pet comprising a hollow flexible light-permeable tube having first and second ends and a plurality of lights mounted within the tube. A housing is mounted on the first tube end and contains a circuit for operating the lights and a battery for providing power for the circuit and the lights. A plurality of catch pins project from the housing. A buckle includes a ring mounted on the second tube end, a connector projecting from the ring, and a plurality of buckle holes in the connector so that the catch pins and buckle holes are selectively engageable and disengageable for connecting and disconnecting the first and second ends with respect to each other.