For all their lives the dogs are curious and ready to lap up the smells. They never tire of adding and updating records into their smell database. But unlike us who are most clumsy in forgetting and making use of databases, who make the data base only when lots of data lies here and there becoming unmanageable. They on the other hand, make best use of this repertoire. You can always find them smelling, smelling and smelling.
In fact if a dog is not curious about smells, it is quite true that he/she is ill.