Many dog owners suspect their pet is smarter than the average hound.
And soon they could be able to prove it - as researchers claim to have devised a reliable IQ test for canines.
British scientists have carried it out on border collies and found that dogs vary in how clever they are - just like humans.
They also discovered that animals which excelled at one task tended to do well in others, again following the pattern of how human intelligence works.
The research has a serious purpose, as it could help the team understand the link between intelligence and health problems such as dementia. Dr Rosalind Arden, from the London School of Economics, said: "In humans there is a small but measurable tendency for people who are brighter to be healthier and live longer.