Hoover

Clicker training is brilliant for this. You first of all teach the dog to target something - you can buy special targets but an old wooden spoon works well too. Then you move on to targetting the hoover, starting with only a bit of it if possible when it's not switched on, working on the sound separately and gradually, then building up to targetting the whole thing while it's switched on, then moving.

It can take a while, over several sessions, and you do end up with a dog that comes running to the hoover for treats each time you get it out! Beats having a scared dog, though.

Shout if you want to try and need help getting started.

Odd, that!

Even if it's just the noise, clicker training will help. It allows the dog to feel (in part) in control of the situation as well as making it all fun and building up positive associations.