Cat grass helps cats vomit hair balls in their stomachs. It can stimulate the cat's gastrointestinal tract. Generally speaking, it is normal for cats to vomit after eating cat grass. If vomiting occurs repeatedly, the breeder can let the cat Drink more water or take probiotics to soothe your gut. If the cat eats a lot of cat grass and this happens, the owner does not need to worry too much. It is caused by excessive consumption.