If you switch off a water tap, where does the water go instead? To all the other places in your town that need water. Ditto the artery. Except mostly it stays in your body.

The surface beneath our feet usually has fairly high resistance. So voltage fades away quickly, electricity doesn't travel too far. If there's a live wire in the earth underground that's broken, a front hoof and a back hoof can be at very different voltages, so the power travels through the horse in preference to the earth. This is not a good thing.

Electricity works on potentials. Horses are particularly sensitive to electric shock because their front and back legs are a good distance apart, the voltage difference is large. They can even die by walking on ground near a broken electrical connection that a human wouldn't detect because of close-together feet. There is a system of electro fishing where current is passed into water to stun fish so they float to the surface to be caught. Counter-intuitively you can stun a large fish with a smaller current than needed to stun small fish. Now imagine the size of a microorganism....

I've one wood store with a pallet floor which works well for ventilation but gives the mice a great place to overwinter. Another has paving slabs as a base - they were about 6 quid a slab (probably a bit more now) but also a killer to bring home and place, cos they weigh 60kg each.

Can you get something with a strong suction cup on it? Once the wrong stuff has dried, try sticking the suction cup to the tile and see if pulling on it removes the tile too. If the tile stays on the wall, call it done?

I've built this kind of furniture before; in the box it comes in you are supplied with the correct hex key to put it together. I always duct tape the key to an unobtrusive part of the furniture in case of need for disassembly.