Our dog was not even a bomb dog, but the sound of our bread maker on knead used to get her all worked up. It was funny at first. It would go WHUMP WHUMP WHUMP and she would bark at it until it "stopped". It would do it again and she would bark until it stopped...this would go on for the whole cycle.
Finally, I put the bread machine on the floor for her to check out. She was satisfied that it was NOT trying to attack me and stopped barking.
Krok may not have ever heard these sorts of noises. I'm sure there are other posters who can give you some great advice on how to introduce him to "house noises". He looks and sounds like he is settling in.
Scarlett WGSD 2/07 CGC TDI(retired)
Paige Husky/GSD mix 2/95-12/08
If you are going through hades, keep going!