I’ve got to admit I’ve never paid much attention to which way Ace’s tail is wagging — mostly to the right, or mostly to the left.
More often, it just seems to go back and forth, one side to the other, which is kind of the definition of wag.
But researchers in Italy, who first reported that the prominent direction of the wag signifies whether a dog is experiencing positive or negative feelings, now say other dogs are aware of this subtle distinction, and apparently have been for some time, indicating they — dogs — are much more on top of things than researchers.
Researchers at the University of Trento, in a new study, had dogs watch videos of other dogs wagging their tails. They found, according to a study reported in the journal Current Biology, that dogs watching another dog whose tail is wagging left showed signs of anxiety, including a higher heart rate. When watching a tail wag right, they remained calm.
When watching “Two Broke Girls” the dogs asked if they might please leave the room. (Not really.)
Returning to seriousness, the Italian researchers first reported in 2007 that dogs convey a wide array of emotions through the tail wag — not just happiness. A wag to the left indicates negative emotions; a wag to the right indicates positive ones. The directions are as seen when standing behind a dog.
In the earlier study, 30 dogs were placed, one at a time, in a large box surrounded with black plastic to prevent any visual stimulus (except maybe to dogs who find black plastic stimulating). The dogs were then shown a stimulus for 60 seconds — a dominant Belgian Malinois, a cat in a cage, their owners, and a strange human, by which we only mean one they hadn’t met.
A system for measuring the tail movements of each dog was established — far too complex to go into here. Suffice to say, as the scientists put it:
“Tail wagging scores associated with the different stimuli were analyzed from video-recordings. Positions of the tail were scored every 10 seconds by superimposition on the computer screen of a cursor on the long axis of the body: the maximum extents of the particular tail wag occurring at each 10 second interval was recorded. Using single frames from video recording two angles were identified with respect to the maximum excursion of the tail to the right and to the left side of the dog’s body. Tail wagging angles were obtained with reference to the axes formed by the midline of the dog’s pelvis – the segment extending lengthwise through the dog’s hips, drawn from the largest points as seen from above and the axes perpendicular to it.”
When faced with their owner, dogs exhibited a “striking right-sided bias in the amplitudes of tail wagging.” Less robust right-sided wags were observed also when the dogs were shown unfamiliar humans. When faced with a cat, dogs showed very reduced tail wagging, but still a slight bias favoring the right side. Seeing a dominant unfamiliar dog led the dogs in the study to wag more to the left.
The first study reported: “How far asymmetric tail-wagging responses are associated with postural asymmetry in preparation to the stimuli is difficult to say.” (You can say that again) “It is likely that control of the flexure of the vertebral column is the same for the tail as well as the rest of the column, but the method we used for scoring tail-wagging responses and the panels flanking the body of the animal in the test-cage minimized any effect of asymmetric posture associated with spine bending.”
I’ve got to wonder which way the dogs’ tails wagged — or if they tucked them between their legs — when they were listening to the scientists talk.
The researchers stop short of saying wagging tails are a mode of communication between dogs.
“This is something that could be explained in quite a mechanistic way,” said Giorgio Vallortigara, a neuroscientist and an author of both studies. “It’s simply a byproduct of the asymmetry of the brain.” Dogs, he explains, have asymmetrically organized brains, like humans (or at least most of them): ”The emotions are associated presumably with activation of either the right or left side of brain,” he said. “Left-brain activation produces a wag to the right, and vice versa.”
But it would seem to me that if one dog is moving his tail, and another is drawing conclusions from that motion, as the scientists say is the case, that’s communication — perhaps even a clearer form thereof than that to which the scientists are prone.
(Photo: Department of Veterinary Medicine, University of Bari)
Posted by jwoestendiek November 3rd, 2013 under Muttsblog.
Tags: aggression, animal, anxiety, behaviors, calm, communication, dog, dogs, emotions, excited, excitement, experiment, feelings, heart rate, indicators, italy, language, left brain, negative, pets, positive, research, right brain, scientists, signs, tail, tails, university of trento, wag, wagging, wags
Sheena’s former guardian, identified only as Gayle, surrendered the dog to the North Utah Valley Animal Shelter (NUVAS) in hopes of finding her a new home, according to the PETA Files
Sheena wasn’t getting along with another dog in the house and Gayle could not afford to keep three large dogs.
After surrendering Sheena, Gayle, visited the dog several times at the shelter in Lindon, Utah, to make sure that she was being cared for. One day, though, when Gayle called to check on the dog, she was told Sheena was gone.
Shelter staff informed her that Sheena had been sold to the University of Utah, and declined to say much beyond that.
Gayle contacted the university to determine whether Sheena was still alive, then called PETA’s emergency hotline, which informed her that NUVAS regularly sells dogs — some of them the same ones they feature on their website as cute, cuddly and adoptable — to the university for use in medical experiments.
According to PETA, dogs recently purchased by the university from the animal shelter have had holes cut into their chests and necks, and pacemakers implanted onto their hearts in order to induce irregular heartbeats; the dogs were then killed and dissected.
(A PETA petition urging the shelter’s board of directors to cease the practice can be signed here.)
Gayle called the university and demanded her dog back, and with assistance from PETA found a foster home where Sheena will stay until a permanent home can be found.
(Photo: Courtesy of PETA)
Posted by jwoestendiek December 23rd, 2010 under Muttsblog.
Tags: animals, dogs, experiment, experimentation, experiments, foster, laboratories, medical, north utah valley animal shelter, nuvas, people for the ethical treatment of animals, peta, petition, pets, rescue, sells, sheena, shelter, sold, surgical, university of utah, vivisection
A new study confirms the notion that self-control is a limited resource, one that can and does get depleted — in humans and dogs.
And glucose, the study says, is one solution to helping us — whatever our species — stay on task, Miller-McCune magazine reports on its health blog.
The University of Kentucky study, which appears in the latest issue of the journal Psychological Science, says the same mechanism that regulates human self-control also operates in canines.
A research team led by psychologist Holly Miller conducted two experiments with canines, observing how much persistence they exhibited when given a task.
In the first, 13 dogs were separated into pairs based on their training history. One from each pair was cued to sit and stay by its owner for 10 minutes, with the command being repeated as necessary. The other was simply kept in a quiet room for that same amount of time.
Afterward, each dog was given a Tug-a-Jug toy, a clear cylinder containing treats that can be accessed via a hole at one end — if the dog manipulates it properly. Each toy contained half a hot dog, too large to fit through the hole.
The dogs that had exercised self-control by sitting in place for 10 minutes gave up and discarded the toy more quickly than the others.
In a second experiment, 22 dogs repeated the first experiment with an additional component: Half the dogs were given a glucose drink prior to grappling with the toy, and half were given a sugar-free beverage.
“Dogs given a glucose drink persisted in interacting with the toy whether or not they had had to exert self-control prior to the test,” the researchers report, adding the glucose apparently replenished the animal’s capacity to keep at the task.
Previous research has shown glucose has a similar effect on humans.
“People can control their own behavior,” Miller said. “When they fail, it is not because they are terrible or weak; it is because they are depleted … If they want better self-control, they can build it. They can encourage their bodies to store more self-control fuel via exercise.”
Posted by jwoestendiek March 18th, 2010 under Muttsblog.
Tags: animals, canines, depleted, dogs, exercise, experiment, glucose, holly miller, humans, news, persistence, pets, replenished, research, science, self control, study, tasks, university of kentucky, willpower
This is likely an advertisement in disguise (for the Sony Ericsson C510, with Smile Shutter), seems a trifle staged, and is far from scientific. But it passes the cute test.
In the video series, a camera is attached to the necks of different pups to document the reaction of the women the dog attracts. The purpose: to determine which breed is the best chick magnet.
In case you don’t have 10 minutes to spare, here are the results: The samoyed drew the most females, but the pug — at least in the view of the two dudes in the video — drew the hottest ones.
Posted by jwoestendiek June 5th, 2009 under Muttsblog, videos.
Tags: advertisement, border collie, breeds, chick magnet, dogs, experiment, pug, samoyed, smile shutter, sony ericsson c510, video, women, yorkshire terrier, youtube
Who needs children when a puppy can provide a similar emotional experience?
New Scientist magazine recently asked that question in an article about a Japanese study that showed relating to dogs causes a surge of the same hormones triggered by nurturing an infant, romantic love and close friendship.
Oxytocin, also known as the “cuddle chemical” and the “love drug,” has been found to relieve stress, combat depression, breed trust in humans and generally make life more worth living. When two humans bond, their oxytocin levels increase.
Miho Nagasawa and Takefumi Kikusui, biologists at Azuba University in Japan, suspected social contact between two different species might boost oxytocin levels, as well.
“Miho and I are big dog lovers and feel something changed in our bodies when gazed [upon] by our dogs,” Kikusui says.
They recruited 55 dog owners and their pets for a videotaped laboratory play session. Owners provided a urine sample to measure oxytocin levels. They were then divided into two groups — one that played with their dog for half an hour, one that sat in the same room but were told to completely avoid their dogs’ gazes.
Then everybody’s urine was tested again. Participants that spent a long time making eye contact were determined to have experienced increases in their oxytocin levels of more than 20%. Those who avoided their pooches’ gaze saw their oxytocin levels drop slightly.
Among those playing with their dogs, the longer they made eye contact, the higher the increase was in their levels of the hormone.
A flood of the cuddle chemical could explain why playing with dogs can lift moods and even improve symptoms of anxiety and depression, Kikusui says. Possibly, the scientists say, oxytocin even played a part in the domestication of dogs from wolves, about 15,000 years ago.
“Maybe during the evolutionary process, humans and dogs came to share the same social cues”, such as eye contact and hand gestures, Kikusui says. “This is why dogs can adapt to human society.”
Posted by jwoestendiek March 31st, 2009 under Muttsblog.
Tags: azuba university, bond, bonding, children, cuddle chemical, depression, dog, dogs, evolution, evolved, experiment, eye contact, hormone, hormones, humanization, japan, love drug, new scientist, owners, oxytocin, relationship, science, social contact, stress, study, trust