Friday morning bitten in my own backyard

One of my pet duck got mauled pretty bad. Surprised he's still alive. Ducks are pretty resiliant according to the vet. Just making
little lies at the moment as my 11yr old daughter is balling her eyes out and I don't have the heart to tell her yet or her to see him. Time will tell.
Went to lodge a police report obviously as I had to get to the emergency pronto and get a shot + IV + antibiotics. Now they took a deposition and told me to contact the council. I know where the dogs live. Found out the house number this morning 5 houses down the block. Not errant dogs, looked after but obviously not that well fed and roaming around.

They tried to come for seconds this morning but I had fenced it all. They're two Chinese pomeranians. Nasty little things so they fitted between the gate's gaps.
Where to go from here? Would love to hear if anyone has had bad experiences of the sort and what they did. I love pets, cats, dogs but this just not on. Thanks heaps.