What should I do if my cat vomits up undigested cat food?
The reasons why a cat might vomit undigested cat food are as follows:
1. Physiological vomiting may be caused by the cat eating too much and becoming overfed, which is a normal phenomenon;
2. Gastroenteritis may be the cause, possibly due to a problem with the cat's diet, leading to gastrointestinal issues.
3. It could be due to illness, such as feline panleukopenia. 
When a cat vomits, the owner should first observe the cat's mental state and appetite. If the cat is otherwise normal except for vomiting, it may be physiological vomiting. However, if the cat has other abnormal symptoms, the owner should take the cat to a veterinary hospital for examination and treatment as soon as possible.
