If your house burns to the ground, there is a likelihood that the fire safe was not enough to save the contents.
Doesn't matter how secure that box is if a gun is put to your or your loved one's head, you will open it.
Layers. Security, dogs, gun to his head.
That a good plan. Still it's like other plans, not foolproof.
Some good food for thought.
Nothing is "fool proof", but in my opinion, dogs are the least predictable, and the best bang-for-your-buck.
Most people don't want to mess with an unknown dog, or three.
Tea-cup or pocket-pet "dogs" don't count.