Experts at Cornell University, Arizona State University and Harvard University say dogs form strong emotional bonds with humans and other species.

Those assessments — offered by researchers and animal-welfare groups consulted in a recent feature — feed into a broader conversation about how people care for and train dogs. Estimates cited in the discussion suggest there are on the order of hundreds of millions of dogs globally (commonly around 900 million to 1 billion), among a global domestic animal population numbering in the many billions, and specialists point to specific behaviors and training methods as signals of attachment.

At Cornell University’s Duffield Institute for Animal Behavior, Dr. Kate Anderson, assistant clinical professor, emphasized the breadth of dogs’ attachments. “they certainly form strong emotional bonds with other dogs, humans, and even other species,” she said, attributing social flexibility to dogs’ long history alongside people. Recent research supports this, indicating that dogs possess sophisticated emotional intelligence, including specialized brain regions for processing human voices and sensitivity to the emotional tone of our speech. What recent studies have shown about the emotional intelligence of dogs?

Clive Wynne, Ph.D., founding director of the Canine Science Collaboratory at Arizona State University, described a simpler expectation for caregivers. “Doggie dads are the worst deadbeat dads you ever came across [in the animal kingdom],” he said, adding, “You just have to be there. That’s what you need to do.” His remarks underline researchers’ focus on consistent presence as a pillar of canine relationships. Spending consistent, positive time together, such as through interactive play and reward-based training, has been shown to enhance the bond significantly, fostering trust and communication between dogs and their owners.

Erin Hecht, Ph.D., assistant professor in Harvard University’s Department of Human Evolutionary Biology, summarized how dogs learn about people: “Dogs learn what to expect from people through experience.” That learning occurs across daily routines, directed interactions and the outcomes animals receive from humans. The emotional climate during these exchanges is crucial, as dogs are capable of emotional contagion—picking up on their human companions’ joy or stress.

The British Columbia Society for the Prevention of Cruelty to Animals has conducted studies on dog training and its effects on human-dog relationships, and those findings appear in broader coverage of the topic. The organization’s work, cited alongside other observations, found that dogs trained with reward-based methods showed more consistent evidence of secure attachment to their guardians. According to the American Veterinary Medical Association (AVMA), about 45.5% of U.S. households own dogs as pets, highlighting the relevance of effective training strategies to a large segment of the population.

Researchers point to observable behaviors as evidence of those bonds. The feature highlights instances of dogs taking care of vulnerable creatures like kittens and ducklings as examples of cross-species prosocial behavior that dovetails with attachment theory in humans and animals.

Those behavioral examples sit alongside laboratory and field observations that measure responses to separation, reunion and the predictability of human actions. In the feature, analysts connect predictable, positive human behavior — such as reward-based training and steady presence — with outcomes that resemble secure attachment in companion animals.

The reporting frames these conclusions within practical questions about how owners, trainers and shelters handle socialization and caregiving. Advocates and scientists say the patterns are relevant to decisions about training approaches and the design of programs at shelters and clinics.

Readers can find the original feature at Kinship, which compiles the experts’ observations and the organizational studies that inform them.

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Original reporting: view the original article.