I worked Dino twice in tracking over the weekend while on lunch break at Petaluma agility show.
Tracks were on concrete paths in a busy fairground. Some parts were straight (beginning legs) and then I would make a right or left turn and then fade into wide curves at two steps. He got all them dead on. He never lifted his head. On the last track on Sunday, we went into gravel from concrete. I think he was inhaling the gravel, but he stayed on the track. He even found it when I couldn't see it. The turns were tighter curves at two steps. He did great.