After watching some of the Westminster Dog Show, it seemed only natural to rewatch Best in Show. And it's still funny, although I'm increasingly noticing that Christopher Guest doesn't really exaggerate things all that much. That Showbiz Dogs show had people exactly like the ones in this movie.
When I watch Best in Show, I'm always impressed at how long they hold back on Fred Willard. I'm sure they had hours of him being hilarious, but they don't deploy him for something like 45 minutes. That suggests a lot of confidence.