Because you are not showing the dog you are the pack leader. The dog is insecure because it has no leader. Your dog is not balanced. Please go to the link below for more info on getting your dog balanced.
The dog is obviously Scared using a certain treat may help and when the dog is in the living room loads of praise must be given, but when the dog is in that room it is best not to give him/her into any trouble they may get nervous again
you can't. but you can put him in a sound proof room when fireworks night happens every year.
When a dog is afraid of lighting it is called a noise phobia.
They are not afraid they want to play
If your dog is afraid of others, he/she was not properly socialized.
They don't want to be hot dog
The dog is probably not in the room at this time.The dog may have left the room.Okay?
They might like you, or be afraid of you.
anything larger then it
If your dog is afraid of lightning, it will be afraid of a camera flash to. It could also be the sudden frequency that scares him.
There is a dog and cat in the room. You're naming them separately therefore you don't need the sentence to be plural.
If they associate that room with something they don't like happening, they will avoid the room. For example, some dogs don't like going into bathrooms because they don't like taking baths.