According to Intelligence Ranking by breed:
Adaptive Intelligence (learning and problem-solving ability): this is specific to the individual animal and is measured by canine IQ tests.
Instinctive Intelligence: this is specific to the individual animal and is measured by canine IQ tests.
Working/Obedience Intelligence: this is breed dependent.
For my dog:
Chihuahua: 67 – Fair Working/Obedience Intelligence.
Shih Tzu: 70 – Lowest Degree of Working/Obedience Intelligence.
In other words, I have a pretty dumb dog. But that’s okay, because he’s CUTE.