Dogs bark for a variety of reasons, including to communicate with other dogs, to express emotions, and to defend themselves or their territory.
Dogs bark to mark their territory and to warn other dogs to stay away.
If your dog is barking at other dogs, it is important to first identify the reason why they are barking. Once you know the reason, you can take steps to address the issue.
Make sure your dog is properly socialized from a young age. This will help them learn how to interact with other dogs in a positive way.
If you have tried the above tips and your dog is still barking at other dogs, you may need to seek professional help from a dog trainer or behaviorist.