My 6 month old shepherd- Cú- killed one of my ducks.
He's an outside dog and doesn't show much aggression, we have a year old mountain dog and the two get on great.
Cú barks at strangers but has never bitten or snarled, he's never even given me a nip. I'm afraid that this is a watershed moment and he'll just get more and more mean
I really liked that duck and neither of my dogs showed any animosity twords the ducks before.
I suppose I've been lax about training, I walk him everyday but Haven't taught him any commands. I tried with "sit" for a few days but he never got it. Both dogs have free run of the farm and are never indoors.