I'm getting pi$$ed off just reading this. I would have to find out what happened and get some resolution
I had a lease in GA, about 150 NE of you a few years back, and we had a feral dog problem. Over the years, several dogs were shot, a couple dropped on the property, but As far as I know the problem still occurs from time to time.
If it was dogs, it's a hard problem to solve as the frequency of occurrence is impossible to predict. You just can't pattern a domestic dog that is allowed to run or otherwise escape. In our situation the suspect dogs could be found around the local dumpster. 1 of the locals would stop by the dump at night from time to time and "light it up" and cull the dogs. I think some people will give food to strays. This produces a situation that encourages breeding and more strays. looking at Doerun, I'm guessing there is no "animal control" and if there is, it's obviously inadequate. Georgia is like most states and has provisions for killing dogs that attack live stock. So, you are well within your rights if you kill one of these dogs.
I suspect that your problem is similar to the one we had and the culprit is domesticated dogs, rather than a wild animal. I would check the pen/ fence for hair and look for tracks around the area. Look for trails left with tracks. This should give some idea of the size of the dogs.
He mentioned that the raccoons could have possibly called in the animals to the area that attacked my goats. I don't know, but I guess it's possible.
To suspect that the racoons "called in" other animals is a nonsensical concept in my opinion. I think someone watches too much Disney or something. Is your friend suggesting that this was some kind of planed retaliatory attack because you trapped a few coons and a marsupial?
I just can't buy that but maybe you have really weird situation.
I would invest in some outdoor lighting, either dawn to dusk or motion activated. Keep a shot gun or rifle at the ready. There's a small chance that one of the culprits may have the owner's identification on it. If you can get that dog then you know where the problem lies.