Very sweet!
The good thing is right now he's just curious playful pup. He should be well adjusted the way you are working with him. And by the the time the guard instinct kicks in it will include protecting your fowl.
Glad to hear you have more duckies coming!
I wonder, you seem willing to put in lots of effort for your animals... have you tried using ferment feed as a means of saving $? It is supposed to increase nutrient absorption and probiotics. And the difference in the poo is incredible, it still smells but not as bad and is mostly formed. The chickens love it and it isn't a lot of extra work. If you don't already do it, I highly recommend it.
Your life is blessed!!! And I am happy for you.