It could be good, could be bad. I was at a trial and the person running before me got a very live crippled flier. The duck was walking around in the AOF, very visible to the dog and everyone in the galllery. The dog acted like he didn't see it or care about it. When the handler finally got the dog back they said that there were "pet" ducks where they trained and the dog had been taught to ignore thm.
Hopefully it won't be a problem for you.
Hopefully it won't be a problem for you.