The firmness of the dog cage

If you go to buy a cage, you will find that the texture of the cage is mostly iron, with wire or cylindrical square iron bars. For smaller dogs, wire bars can be used, but for larger and stronger dogs, square iron bars should be chosen, which is much stronger than wire bars. The advantage of iron wire is that if you don't need it anymore, it can be folded up and put away, while iron bars are not. My house still has a small cage made of pink square iron bars that I used when I was a child. Although it's useless, it's wasted and discarded, so I keep it at home.