The reasons why a cat foams after eating cat grass: 1. The cat eats cat grass and it has an effect, and the hair balls in the cat’s belly are discharged. 2. There are pesticides on the cat grass that cats eat, which can cause poisoning in cats. 3. Cats may suffer from gastritis and feline distemper. 4. Cats contain parasites. The parasites are in the intestines and can easily cause cats to vomit.

What to do if a cat foams after eating cat grass:

1. If the cat grass eats by the cat, it will expel the hair balls in the stomach. If so, the owner should comfort the cat, gently stroke the cat's back, and pay attention to cleaning it.

2. If the cat is poisoned by pesticides on the cat grass it eats, it is recommended that the owner immediately take the cat to the pet hospital for detoxification.

3. If the cat suffers from gastritis, feline distemper and other diseases, resulting in vomiting symptoms after eating cat grass, the cat owner needs to take the cat to the doctor for further examination and treatment.

4. If the cat contains parasites, the cat owner can give the cat some deworming medicine, and usually pay attention to deworming the cat once a month to prevent parasites from affecting the cat's health.