The Shiba Inu is not a breed for the faint of heart, as training one can be a nightmare if not done early and correctly. The Shiba needs a strong willed trainer willing to always be stern and confident in his/her decisions. Like most dogs, they can sense any insecurity or doubt, and they will be openly defiant if any of this is present.
The Shiba is a very mischievous breed, and this often shows, especially when bored.
Not everything about the Shiba is negative or frustrating. The Shiba has a definite "one-of-a-kind" personality that is larger than life.