The story behind viral video of vet building trust with scared dog l GMA

The first step is to examine your dog’s body language. According to WebMD, signs of a scared dog include:
Ears lying flat against the head
Dilated (enlarged) pupils
Tail between the legs
Raised hackles
Tense muscles in the body and face
Cowering close to the ground
Exaggerated yawning
Your dog’s behavior can also indicate that he is afraid. A scared dog shaking or trembling is a pretty obvious sign. He may also bark constantly, whine or whimper. He may also show signs of aggression such as growling.Dogs are incredibly reactive beings. They pick up very quickly on the emotions of people around them. It’s because of their social nature; dogs are descended from wolves, which are pack animals. A wolf’s life depends on reading the emotions of his pack. If the other pack members are scared or aggressive, it’s a sign that there’s a threat nearby. So, it stands to reason that if you’re showing negative emotions, your dog will pick them up.When walking around the home, move slowly and deliberately. Avoid fast or sudden movements.
Let your dog know you’re approaching by humming quietly or talking to yourself.
Avoid loud noises, such as yelling and screaming. Explain to children that the dog needs peace and quiet.
Close doors slowly and gently, so that they don’t slam.
Make use of scents. Use a scented diffuser near your dog’s bed, so that he comes to associate a particular scent with relaxation. Then, use this around the home to help him feel calm.
This is also the key to how to make a dog-friendly to strangers. 
How to Get a Scared Dog to Trust You Completely