Pet cages can usually be classified according to their purpose and type of pet. The following are some common categories of pet cages:
1. Dog cages: Iron cages specially designed for dogs, available in different sizes and shapes, and can be foldable or fixed.
2. Iron cage for cats: Iron cages specially designed for cats usually have smaller sizes and are suitable for cats to rest and play in the cage.
3. Iron cage for small animals: suitable for small rodent pets, such as hamsters, chinchillas, etc. There are usually smaller gaps to prevent pets from escaping.
4. Iron cage for birds: suitable for bird pets, such as parrots, pigeons, etc. There are often multiple levels and doors to allow birds to move freely and spread their wings.
5. Iron cage for fish: suitable for small aquatic pets, such as small fish, conches, etc. Usually mesh design to keep water flowing smoothly.
6. Iron cages for other pets: According to the needs of specific pets, there are also other types of iron cages, such as iron cages for rabbits, iron cages for snakes, etc.
The above are just some common classifications, and the specific choice still needs to be decided based on the type of pet and its needs.