One of the benefits of herbal/natural products is that it is pretty difficult to actually "overdose" a pet on our supplements.
If the body can not absorb all of what is administered, it is generally passed through the body via the normal elimination channels. If your pet feels overwhelmed by the amount of product given, it is possible that there may be some diarrhea or vomiting, but in most instances if or when other customers have done something similar, there really wasn't any need for great concern.
If you see any behavioral changes or any kind of reaction in your pet, please do not hesitate to consult your veterinarian.