Since this is a thread about dogs, I may as well add a comment here that says as much about intelligence testing as about dogs.
The science project (seen on TV) was to determine which are more intelligent, domestic dogs, dingos, or wolves. At least six of each were tested.
Three intelligence tests were given.
1. A simple maze leading to food.
2. Moving to where a human points.
3. An impossible challenge, the intelligent response was to give up quickly.
Wolves did much better than domestic dogs on intelligence test 1.
Domestic dogs did much better than wolves on intelligence tests 2 and 3.
Dingos scored partway between wolves and dogs.
What this highlights for me is the exceptionally good idea of using all three of these different types of intelligence tests.