The reason I use the word gang, as opposed pack, is that the word pack is often used in a negative way. On some occasions when I am walking, I get told that the dogs will act as a pack. I often have to explain to people that domestic dogs coming together from various homes do not act as a pack. The word pack gives people the image of the dogs working together in order to attack their prey, so when we are out some people think a group of dogs will attack their dog. This is not the case, it is true that some dogs are more reactive than others, but I have never witnessed the rest of the dogs joining in when one of the others bark or go to chase another dog. A pack of wolves work co-operatively and is made up of family members which has little resemblance to a group of dogs who meet to go out together for fun. When we are out walking, I will distract the dogs and change direction if we come across another dog. I do feel it can be overwhelming for a loan dog, with their owner, to have several approaching them at once.
Regroup everyone, time for a treat! 
Bark and Stride 