It is no secret that people tend to favor their right or left hand for writing, throwing, eating, and many other tasks. The actual number of righties, lefties, and those who are ambidextrous is not clear. Many scientific studies concerning handedness have been unable to determine why some people preferentially use one hand over the other. Researchers have looked at other animals to help solve the riddle. Dogs and cats are among those studied because they prefer their right or left paw and some are ambidextrous.
The University of Manchester did a study of paw preference in dogs and found about 50% were right pawed, 50% left were pawed, and a statistically insignificant percentage were ambidextrous. Dr. Luke Schneider and collaborators at the University of Adelaide in Australia, studied 73 dogs and found 29% were right pawed, 34% were left pawed and 37% showed no apparent paw preference. It is clear dogs have a preferred paw but the number of righties and lefties is not certain.
It is apparently even more difficult to determine paw preference in cats. Discovery News reported a study of 21 male and 21 female cats with interesting results. When challenged with simple tasks, the cats did not show a particular paw preference. Cats that were fooling around and playing used either paw indiscriminately. Only when faced with more complex problems or trying to get food, did the cats exhibit a clear paw preference. Researchers at Ataturk University in Turkey found about 50% of domestic cats studied were right pawed, 40% were left pawed, and about 10% were ambidextrous.
It should not be surprising that precise numbers of right and left pawed dogs and cats vary from study to study. In humans it is estimated that 70 to 95% of people are right handed, 5 to 30% are left handed and some small indeterminate percentage of people are ambidextrous. It is obvious that humans, dogs, and cats demonstrate a preferred hand or paw but science has been unable to come up with precise numbers of righties and lefties.
Some observations have been made about the organization of the brain and emotional differences between righties and lefties. It is well established that in humans, dogs, cats, and other animals the left side of the brain controls the functions of the right side of the body and the left side of the brain controls those on right side of the body. So the left brain is responsible for righties and the right side is accountable for lefties. But there is more.
It seems that in humans the left side of the brain controls positive upbeat emotions like love, safety, and calmness. The right side of the brain controls negative feelings like fear, aggression, and fleeing. This goes along with evidence that left pawed dogs tend to be more aggressive to strangers. That doesn't mean that your right pawed pup will be a tail wagging Pollyanna all of the time although it has been shown that happy situations tend to make a dog wag his tail to the right. Nor does it mean that your left pawed pooch will be grumpy with strangers, but negative situations tend to stimulate tail wagging to the left. Much more research remains to be done. But it is interesting that paw preferences in dogs tend to mimic similar emotional patterns in people.
If your curiosity is aroused, you may wish to do some simple tests to determine if your pet is a righty, a lefty, or ambidextrous. Have fun finding out.
These are easy tests the experts suggest if you would like to determine if your pet is a righty or a lefty.
One test isn't sufficient. You should do a few different tests and several repetitions of each to get an accurate picture of which paw your pet favors. If your pet shows no obvious paw preference after 100 or more tests, he is probably ambidextrous. Results can be complicated as arthritis or an injury may alter which paw a pet uses.
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With a Ph.D. in Biological sciences from the University of Texas in Austin and a masters in Zoology from Southern Illinois University, Dr. Sue is devoted to the care and massaging of pets. Read her articles here.