Abstract: A pet animal collar comprises a processor unit configured to effect illumination patterns comprising a combination of color and blink for an array of light sources on the collar. A memory unit coupled to the processor stores multiple illumination patterns, and a radio receiver unit provides wireless remote access to the processor unit to enable uploading and/or selecting at least one of illumination patterns. In some aspects, the processor unit responds to sensor signals from a sensor unit (such as an accelerometer) on the collar to select or change a displayed illumination pattern. A computer program product includes a non-transitory computer readable medium storing software instructions that cause the processor unit to control and adapt the illumination patterns.