There are plastic floor coverings in the form of small perforated grids on the floor of your cages. It is obvious that the dog's poop will not fall through these grill holes. So what are these perforated grid bases used for? Is it used to pass the dog's urine down? In the lowest section of the roofed cage in the middle, there is the last bottom tray or plate made of galvanized sheet metal or another material. There is also a large diameter PVC drain pipe (probably 7 or 10 mm in diameter) behind this subplate. Since rain will not fall into the cage in cages with a roof, I think this PVC pipe is used to drain the dog's urine, not rain water. If so, why did you need such a large diameter pipe to expel the dog's urine?
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