Because your dog feels all the emotions you are expressing. If someone was crying you would maybe sympathize with them, that is basically what your dog is doing.
When a dog is in distress it can either whine or whimper.
It means that she doesn't like the dog, because she is giving a odd whine which you don't hear often because dog's in the neighbourhood are quite friendly. But to your dog these dogs she give a odd whine to is porbably a dangerous dog.
Usually they act differently from normal - they may stop eating or drinking, may whine or lick part of their body like it hurts, or even vomit or have diarrhea.
You can train your dog to whine when it needs to use the bathroom by first teaching them to associate a specific whine with going outside. Take your dog out frequently to the designated bathroom spot and reward them when they go. Eventually, your dog will learn to whine to communicate this need. Be consistent and patient throughout the training process.
he must not like your sister.
Usually, dogs will act more aggressively if they are in pain. But this is not the rule- you just have to watch carefully to see if the behavior of the dog is in any way unusual.
The gul makes a kind of barking sound like a dog mixed with a whine of a dog so its hard to tell the real sound
no
Dogs whine for a lot of reasons. This could be one of them. Dogs can tell by the smell when another dog is in estrus, so an intact male dog might very well whine to get out to visit a nearby female in heat. A neutered male probably won't care much.
like a manieact
If your dog is doing that he probably just wants something like food or to go outside!
I hope not!