See how long it takes for Rover to develop and association to a visual signal. After Rover seems to be getting the hang of this, wave a clean swab in front of his nose. If Rover lies down, even without the correct scent signal, walk away and ignore him for 30 seconds and then try the test again. If your dog does not do well on these exercises, do not despair. These little tests are just as arbitrary and just as inaccurate as anything you will find in the popular media.
Dogs come in hundreds of basic types and millions of individual personalities.
There is no basic test that can fairly rate the intelligence of dogs. The fact is that the average Afghan hound gets fed, bathed, brushed, walked on a leash and pampered without having to lift a paw. By contrast, the border collie has to chase sheep all day, skip meals and live outdoors in driving rain or scorching heat. It appears that intelligence , like beauty, is in the eye of the beholder.