As a Border Collie and Exhibition Poultry enthusiast I can say there is noway on Earth that those ducks could have been left out to play with that dog, no matter how good he is. Dogs are Dogs and as such have natural instincts to chase and herd small animals.
I hope you find him a wonderful forever hom as he is a rather handsome lad. ( I can feel my heart melting already, and naughty voice saying "what's one more?"
Footnote: I find it rather strange that they chose the ducks over the dog. :rolleyes:
Kind regards and best wishes,
josh :p