That is fine to take the dog to the pound IF you can SAFELY catch it. I have seen some dogs that are not even leash trained and would flip out or bite if they were put on one (stupid owners again)
Did the dog owners pay for your goats? The vet bill on your mini?
Here it is legal to shoot dogs that are chasing livestock. However, if you dont have the heart to do that, GET IT ON FILM and sue the dog owners for the losses!! Not only that, but losses that future offspring would have brought and anything else you can think of. That is usually the only way to get through people's thick skulls, is through the pocketbook, when they not only dont care about their own animals by allowing them to run loose, but certainly dont care about yours either!!!
I have had to 'remove' dogs in the past- sure dont like doing it, but it's better than seeing the end result with the livestock!
Let me guess, the dog has been 'removed' now, and I wonder if the owners have even WONDERED where their dog is?! Hopefully they wont go out and get another to replace it!!
P.S. Just edited to note that a dog that is in a frenzy chasing or killing animals can turn on YOU too, not making it possible to catch it and safely put it somewhere!!! I have seen this happen more than once!