Cats can eat peanut butter, but it is generally not recommended. While peanut butter is not toxic to cats unless it contains harmful ingredients like xylitol, it offers no nutritional value for them. Peanut butter is high in fat, calories, and sometimes added sodium, which can be unhealthy for cats. It can also pose choking hazards and cause gastrointestinal upset or allergic reactions in some cats. Peanut butter should only be given in very small amounts occasionally, such as to hide medication, and the peanut butter must be free of xylitol and other toxic additives. Overall, peanut butter is not an ideal treat for cats and should be given with caution and only in minimal quantities.