Pet cats cannot eat onions and garlic. Onions contain a certain amount of sulfide, which can cause hemolytic anemia in cats. You cannot eat garlic because garlic is an irritating food. If a cat eats it, it will stimulate the cat's sense of smell and gastrointestinal tract. The cat may suffer from diarrhea, vomiting, gastroenteritis and other symptoms.

What to do if a pet cat accidentally eats onions and garlic:

1. If the food intake is very small, it may not affect the cat.

2. If a cat eats too much, it will irritate the cat’s gastrointestinal tract and cause symptoms such as nausea and vomiting. It will also cause symptoms such as hemolysis and hematuria.

3. After the cat eats green onions, you should observe the changes in the cat at any time to see if there are any abnormalities in appetite and urination and defecation.

4. If adverse symptoms occur, you need to take the pet to the pet shop for further examination and timely treatment.