Hang on to your dog.
I asked a friend to hold my finished dog in the gallery as I was handled his dog in a seasoned test. It was a tough test that changing wind and bird placement had turned one bird of the land double into a mark that nearly everyone was having to handle on. My friend's dog was no different. He blew by the mark and I started to toot a come in whistle. Looked over my shoulder just in time to see my dog charging to me with my friend in hot pursuit. A sharp sit whistle stopped them both in their tracks. Fortunately the seasoned dog ignored the sit whistle and continued in until it winded the bird.
Thought the judge was going to pee her pants laughing.