
Best thing about dog shows as opposed to cat shows (where you have to stay until 5 pm) is that you can leave when you have been judged -unless you need to stay for further judging (even then if you win BOB you don't HAVE to stay for the group). At Blackpool the other week we left at about 11 am and took the dogs to the beach for a few hours, now that's the way to end a show. :)
In addition to Crufts I seem to remember Belfast has a time you have to stay until, but those are the only two shows I am aware of.