1. Hairball Paste: Hairball paste is a nutritional supplement specially designed for cats. Its main function is to help cats expel accumulated hair and prevent hairballs.
2. Cat grass: Cat grass (such as wheatgrass, barley grass, etc.) is rich in fiber, which can stimulate the cat's gastrointestinal motility and help the cat expel hair from its body.

3. Other fiber-rich foods: Besides cat grass, some herbal foods (such as raspberries and rosemary) and fruits and vegetables (such as pumpkin and apples) are also rich in fiber, which helps cats digest and eliminate hairballs. However, these foods are not suitable for all cats and should be fed in moderation to avoid causing indigestion and other problems.
4. Foods containing lubricating ingredients: Oils can lubricate a cat's intestines, helping to expel hairballs smoothly. Examples include olive oil and sardines. However, these foods should be fed in moderation to avoid overfeeding and causing obesity or other health problems in cats.