Go first, and when setting up sneak your other dog into the tunnel with a handler - if there's a tunnel near the end of the course. Then when he goes into that tunnel have both dogs come out and finish the course. Act shocked, then have a bunch of the handlers go look in the tunnel to see 'what happened' so the extra person can sneak out.
Spin, bow, flying finish..... there's lots of neat tricks. The flying finish (aka a right finish around your legs but without the stop and sit) comes in handy for weave pole entrances that are nasty.