Ari sort of knew how to Stay, but couldn't hold it if you walked too far away. When teaching him his people made the very common mistake of calling him to them, then giving him a treat. By doing so they were, in fact, rewarding him for coming rather than staying! By going back to Ari and actually reinforcing him for staying we were able to greatly improve his stay in just a matter of minutes.
Jeff Dentler, CPDT-KA, IAABC-ADT, FFCP, CTDI