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A relationship like no other

May 10, 2019

Latest Thought Huddle podcast explores the deep and abiding love humans have for dogs

It doesn’t take special insight to recognize dog owners love their dogs. A lot. But the latest episode of ASU Now’s Thought Huddle podcast series digs deeper in an effort to unearth the origin of dogs, explore the purpose of dogs and assess what makes dogs special. Of course, heartwarming stories from dog owners are also part of the mix.

Thought Huddle host Mary-Charlotte Domandi speaks to three dog experts to explore the powerful and poignant human-canine bond. These include Greger Larson, University of Oxford evolutionary biologist; Linda Milanesi, executive director of Assistance Dogs of the West; and Clive Wynne, ASU professor of psychology and author of the forthcoming book "Dog is Love." 

Right from the beginning, Domandi confesses her own wild affection for dogs. “Full disclosure: I’m a total dog person. When I was in my 20s and lived in a city where I couldn’t have my own dog, I spent so much time stopping people with dogs on the street that my friend called me Mary ‘Can I pat your dog?’ Charlotte.”

This deep connection between the two species has been forming over thousands of years. How did it happen? While acknowledging there are still many questions about the origins of dogs, Larson offers one “plausible” scenario.

“Wolves are very plastic behaviorally” and “adapt very readily to changing circumstances,” he says. A pack of wolves “started following people because they were able to take advantage of the resources that people provided. But then people were also getting more accustomed to having wolves around as well and recognized that there were certain advantages to having them around. If that’s enough to get things going, what happens from there is this ever-closening relationship between people and wolves that leads to dogs.”

And that relationship includes working together. Milanesi’s organization has trained dogs to provide human assistance of many kinds, particularly for people with disabilities and medical issues. Recently, these purposeful roles have included training dogs to work in the criminal justice system, usually with special victim advocates.

This can mean providing a calming and supportive influence for children who’ve faced sexual assault, domestic violence — “just unspeakable crimes like you cannot imagine,” Milanesi notes. “Looking at a dog at rest, you immediately feel safe.” It “lowers your blood pressure, lowers your cortisone levels, lowers your heart rate.”

This makes sense to Wynne, who studies the human-canine relationship and leads ASU’s Canine Science Collaboratory. “It is actually dogs’ ability to capture our affections and reciprocate our affections … that makes dogs so successful.” Above and beyond any other talents, “the remarkable thing about dogs is their capacity to form strong emotional connections.”

Find more episodes at

Top photo by Tranmautritam/Pixabay

Steven Beschloss

ASU prof pinpoints optimal age of puppy cuteness

ASU prof's study finds humans think puppies are cutest at 8 weeks old.
~80% of dogs are feral, making human intervention crucial to their survival.
May 7, 2018

Canine researcher Clive Wynne's discovery reveals more about the depth and origin of the human-dog relationship

Editor's note: This story is being highlighted in ASU Now's year in review. Read more top stories from 2018 here.

The popular meme proclaiming that all dogs are puppies assumes that humans’ adoration of canines is not conditional on their age. But a new study led by Clive Wynne, professor of psychology and director of Arizona State University’s Canine Science Collaboratory, suggests otherwise.

In a paper published this month in Anthrozoos: A Multidisciplinary Journal of the Interactions of People and Animals, Wynne and colleagues describe the study, which found dogs’ attractiveness to humans peaks at roughly eight weeks, the same point in time at which their mother weans them and leaves them to fend for themselves.

While spending time in the Bahamas, Wynne was able to observe the many street dogs there. According to him, there are around a billion dogs in the world, 80 percent of whom are feral. For those dogs, human intervention is crucial to their survival. Wynne wondered if there was a connection between pups’ weaning age — when they are at their most vulnerable — and their level of attractiveness to humans. So he designed an experiment to test his query.

“It came out exactly as I’d hoped it would — that there is indeed an optimal age of maximum cuteness, and that age does line up pretty closely with the age at which mothers wean their pups,” Wynne said.

Video by Deanna Dent/ASU Now

“This could be a signal coming through to us of how dogs have evolved to rely on human care. This could be dogs showing us how the bond between human and dog is not just something that we find immensely satisfying in our lives. … But for them, it’s the absolute bedrock of their existence. That being able to connect with us, to find an emotional hook with us is what actually makes their lives possible.”

The study was carried out using a series of photographs of puppies at different ages, from the first weeks of life through young adulthood. Fifty-one participants were asked to rank the puppies’ level of attractiveness in each photo. Three distinctive-looking breeds were ranked: Jack Russell terriers, cane corsos and white shepherds.

Results showed that the pups’ attractiveness was lowest at birth and increased to a maximum before 10 weeks of age before declining and then leveling off.

Cane corsos showed a maximum attractiveness at 6.3 weeks of age; Jack Russell terriers showed a maximum attractiveness at 7.7 weeks of age; and white shepherds showed a maximum attractiveness at 8.3 weeks of age.

black and white photos of three types of dogs at different ages

Sample images of three breeds at different ages. The top row of images depicts a cane corso, the middle row depicts a Jack Russell terrier and the bottom row depicts a white shepherd. The middle column shows each dog at it’s “most attractive” age, as rated by participants: six weeks for Cane corsos; a little over seven weeks for Jack Russell terriers; and eight weeks for white shepherds.

“Around seven or eight weeks of age, just as their mother is getting sick of them and is going to kick them out of the den and they’re going to have to make their own way in life, at that age, that is exactly when they are most attractive to human beings,” Wynne said.

The findings provide insight into the depth and origin of the relationship between humans and dogs, the oldest and most enduring of any human-animal relationship. And while some theories attribute the survival of the canine species to their intelligence, Wynne dissents.

“I think that the intelligence of dogs is not the fundamental issue,” he said. “It’s this tremendous capacity to form intimate, strong, affectionate bonds. And that starts at maybe eight weeks of life, when they’re so compelling to us.”

Though humans and other animals, such as cats and birds, have the capacity to form strong bonds, dogs in particular are especially suited to the task because of their gregarious nature. Even in hand-reared wolves, the species from which all dogs are descended, the willingness to engage humans does not match that of the domestic dog.

“It does seem to me that the dog has something rather special,” Wynne said. “Dogs have a very open-ended social program. That they are ready and willing to make friends with anybody.”

man and dog on couch

ASU Professor Clive Wynne and his dog, Xephos, sit together in their home in Tempe, Arizona. Photo by Deanna Dent/ASU Now

Wynne has thought of a couple of interesting ways to follow up on the cuteness study. One way is to show participants video of puppies at different ages, instead of still photos, to determine if perhaps there is something in the pups’ movement that attracts people. Another is to determine what the pups’ mother thinks about their level of attractiveness at different ages, though that is obviously easier said than done.

The takeaway from the study for Wynne is that extra piece of the puzzle that makes up the human-dog connection.

“[The study] doesn’t mean to say that we stop loving our dogs past [eight weeks],” he said. “The eight-week point is just the point where the hook is biggest, the ability of the animal to grab our interest is strongest. But, having grabbed our interest, we continue to love them all their lives.”

Top photo and video collage by Deanna Dent/ASU Now