In this way, one of the dogs should be removed from the line of sight of the other dog. (howtoguides365.com)
Some dogs turn on the aggression at the mere sight of ANY other dog, even a familiar pack mate when approached off their territory. (thesprucepets.com)
If you know your dog does not get along with other dogs and barks incessantly at the sight of other dogs, then either our Grumpy Growlers or a private training setting would be more appropriate. (eastbayspca.org)