Tell my co-judge and drop the dog. Inform handler ASAP.
I would assume the dog ran the test since the co-judge gave him his number. I would let the dog finish the test. I like to discuss issues like this with my co-judge as soon as they occur (after dog has run) and then have the marshal or us tell the handler ASAP. That way they don't hang around all day thinking they are back and maybe it will jog their memory a bit.Let the dog run the series, the problem may take care of itself. It takes both judges to drop a dog. We can discuss it at the time of callbacks or placements. If this is a minor stake we may decide it is a control break.
Tim