Children's fun cat food is not necessarily poisonous cat food, but depends on the composition and quality of specific products. In order to determine whether a cat food is safe, we can judge it by the following steps:

1. Check the ingredient list: read the ingredient list on the package carefully to see if there are any harmful or inappropriate ingredients for cats, such as artificial colors, preservatives, bran, etc.

2. Pay attention to national standards: ensure that cat food meets relevant national food safety standards. If there are obvious violations, there may be food safety hazards.

3. Choose reputable brands: Choose cat food brands with good reputation and reputation, such as Royal, Dr. Carol, etc. These brands usually have stricter production and quality control standards.

4. Observe the cat's reaction: After feeding new cat food, observe the cat's appetite, weight, fur, feces and so on. If there is obvious abnormality, stop feeding in time and consult a veterinarian.