It has taken longer than the five recommended days to start working, but, now that it is I would say that it is somewhat successful. The dog doesn’t eat the stool right away so we have more time to clean it up. I don’t know what would happen if we just left it lie. I checked with the vet and he sees no harm in continuing the ForBid indefinitely if it continues to work. The vet is going to try it on his own dog.