For supervised play only. Use only standard tennis balls or Chuckit! Brand balls manufactured for use with this product. High speed flying balls can cause injury to people or animals. Do not aim or throw directly at people or animals. Be alert, ball may travel in unanticipated directions. Not for indoor use. Know your dog and choose the appropriate size and type of toy to prevent choking or other harm. Inspect ball and launcher regularly; if ball or launcher is damaged or if parts become separated, remove toy and parts as injury may result. Not a child's toy.