Group dog training classes are always fun and entertaining in addition to being useful on several different levels. Watching other dog/owner teams work out some of the same issues you are facing is both comforting and educational.
For new nose work students one of the first eye-opening things about an official K9 Nose Work ® class (if taught by an instructor certified by the National Association of Canine Scent Work) is that all dogs must be crated or safely secured away from the scent field when it is not their turn to work. The dog that is working, does so with just his owner and the