Hidden Doge

Overview
Hidden Doge, also known as Fake Vault, is a league 1 trap that has the ability to arrest the player/burglar that opens it, it mimics a normal Vault.

Strategy
The Fake Vault is extremely useful, as it is impossible to distinguish from an actual vault without the "Sharp-eyes" ability, which very few cats have. However, that doesn't mean you can just place it anywhere and expect it to work. Fake Vaults in completely isolated locations are very obvious, and most mid-game burglars will not open them. A better option is to place your Fake Vaults very close to your real Vault. This allows you to consolidate your traps more, and also makes it much harder to distinguish the real vault from the fakes.

To avoid these, the best choice is to use a cat/burglar that can detect vaults. However, if you do not have one of these, the only real option is to avoid vaults with no traps around them, or vaults immediately next to Cat God, since they are more often fakes than real.

On defense, consider placing them in spots that will catch escaping burglars, since a Guard Doge will come out if the Fake Vault has not been opened when the real vault opened. However, do note that they are only awake when they hear noise, so putting them just by exits is not a very good idea without the Haunter's possess ability, or the Fake Coin/Spiderweb's slow ability, both to prevent them from being able to outrun the Hidden Doge when they move up/down.

Trivia

 * This is one of the 2 traps that don't fill up the trap counter, the other is the guard doge.
 * This is one of the 3 traps that can arrest burglars, the others are the guard doge and the Mechadoge
 * In the tutorial, you are guaranteed to find this trap.
 * This trap will act as a Guard Doge temporarily once the chest has been found.