Some dog show people are that crazy. There was an email that went around a few years ago about an entire breeding program basically being wiped out by a competitor that poisoned the breeding dogs, but not the older ones. This was in French Bulldogs; the person travelled to shows with her entire “flock”, left them all alone at her set-up, crated, and someone came by and fed them some kind of poison. Sickening that someone would do it. I *never* left my GSP I was competing with unattended, even before hearing this story.
The dog people are crazy, but in a different way. These are European Schutzhund types, not AKC conformation people.