If your cat is vomiting after switching cat food, it's because their digestive system isn't adjusting. It's recommended that you give your cat some probiotics to help regulate their gut. It's also advisable to gradually switch your cat's food, mixing the new food with the old food, to avoid sudden upset. Adding a suitable amount of probiotics to their food when switching can also help prevent vomiting and soft stools. 
Solutions for vomiting in cats after changing their cat food:
1. If your cat vomits after changing its food, you can give it an appropriate amount of probiotics to regulate its digestive system. Probiotics mainly regulate the intestinal flora and improve intestinal function.
2. Generally, it is fed according to body weight, but the content of each probiotic is made differently. Please refer to the instructions for specific feeding amount.
3. You can usually add it to cat food. If your cat resists eating, you will have to force-feed it. Dissolve an appropriate amount of probiotics in warm water and then feed it to your cat using a bottle or syringe.
4. It is recommended that cat owners gradually switch their cats' food by mixing the new food with the old food, and avoid sudden food changes that may cause gastrointestinal discomfort.
5. If there is no improvement after feeding probiotics, it is recommended to take the patient to the vet for examination to determine the cause.
