Items Usage- Not "clothes" or weapons

[Clipper]

Originally Posted by Fremen

5 - If I have the police dog in play, is mandatory to trigger its ability bonus the first time I have to flee, so I lose it if I failed?

If you have the Police Dog in use, you must apply the bonus and lose the Dog if you fail. As you can't change whether or not you are using the Police Dog during a combat, you'll probably have it in use, though.

6 - Is possible to unequip this objects? For example if I am a militia and the next player has the officer's cap since I will be oblidged to help him could I put them not in use by turning them sideways before his combat phase?

You can equip or unequip any Item by turning it sideways. You can do this at any time on any turn unless you are in combat. This is something that can only be done for Items, not Classes, so no, you cannot turn Militia sideways.

You can discard Classes at any time on any turn (including during combat), so you may want to discard the Militia card before the other player asks for your help (if they already asked, it's too late to do this). You of course have no way of getting that card back (unless you have another in your hand or a way to get it out of the discards), though.