Get your dog used to different noises with the help of YouTube. There are several YouTube channels dedicated to sound desensitization for dogs.

How we work sound desensitization 

1. Play sound on a low volume as your dog eats their meal. This creates a positive association. 
2. As your dog gets comfortable, play the sound louder. 
3. Play the sound more frequently while your dog is doing other stationary commands such as down or place. 

YouTube Channels

Calm Pet Volume 1

Newton & Pascal Sound Desensitization