Man holding his dog in Kenya

Dog Facts: Unique Bonds, emotional intelligence and the ‘love hormone’



To celebrate our Better lives for dogs campaign, our research manager, Gemma, has put together some of her favourite facts about dogs.

Dogs were the first animals to be domesticated by man, approximately 15,000 years ago (Serpell, 1995). Today domestic dogs come in many different shapes and sizes, from the mighty Great Dane to the tiny Chihuahua.

All these dog breeds originated from the grey wolf. It may be hard to believe, but the dogs we share our lives with are still genetically very similar to wolves, despite the thousands of years that have passed.

In tune with our emotions

Scientists are learning more and more about the complex abilities of dogs.

Research has proven that dogs are sensitive to our feelings. When shown pictures of people with typically happy and angry expressions on their faces, dogs are able to distinguish between the positive and negative emotions they expressed (Albuquerque et al., 2016). Usually this only happens between members of the same species, so it’s unique to see such understanding across different species. 

Likewise, humans have been shown to read a dog’s facial expressions too (Bloom and Friedman, 2013). We display stronger facial expressions on the right side of our faces, and so we tend to look more at the right side of other people’s faces. Scientists discovered that dogs have adapted their behaviour to look at the right side of our faces too, but they do not do this when looking at the faces of other dogs. These unique abilities have undoubtedly contributed to the powerful bonds between humans and dogs.

Helping the bond with hormones

Not only do dogs know how to read people, they can also cause physiological changes in our bodies that encourage us to love them even more. When dogs stare into our eyes, oxytocin (also known as the ‘love hormone’) increases in both us and them. Similar results are seen when mothers look into the eyes of their babies (Nagasawa et al., 2009).

‘Man’s best friend’ deserves respect

Dogs are kept and bred for many different reasons.

Some are ‘pampered pooches’ regarded as members of the family, others are viewed as protectors or workers, and in some cases, dogs are viewed as meat for human consumption.

This vast spectrum in the way humans view and treat dogs gives just a hint of the many welfare problems they face.

Dogs are sensitive

Dogs often experience emotional stress when left alone even for short periods of time.

The fashionable penchant for big eyes and flat faced dogs such as pugs and French bulldogs leaves many dogs in ill health and immense suffering each and every day. This selective breeding of certain characteristics can cause health problems in dogs, shortening their life spans.

In some communities, thousands of dogs are inhumanely killed, due to fear of diseases like rabies. It is estimated that up to 10 million dogs are culled each year for that reason – 18 per minute.

Better lives for dogs

Better lives for dogs aims to vaccinate 1 million dogs against rabies globally by 2020. This will provide a humane, sustainable solution that gives these sensitive, intelligent animals a chance at life.

Regardless of how they are perceived, or their size or shape, science has proven that all dogs feel complex emotions and have the ability to physically and mentally suffer, which should be acknowledged and recognised.  

You can support Better lives for dogs by donating towards vaccination programmes and crowd-funded gifts, signing petitions to lobby governmental change or by signing up to hear more about our vital work. Keep an eye out on our Facebook and Twitter pages from Monday, for more information.

Further reading

Albuquerque, N., Guo, K., Wilkinson, A., Savalli, C., Otta, E., & Mills, D. (2016). Dogs recognize dog and human emotions. Biology letters, 12(1), 2015088

Bloom, T., & Friedman, H. (2013). Classifying dogs’ (Canis familiaris) facial expressions from photographs. Behavioural processes, 96, 1-10.

Nagasawa, M., Kikusui, T., Onaka, T., & Ohta, M. (2009). Dog's gaze at its owner increases owner's urinary oxytocin during social interaction. Hormones and Behavior, 55(3), 434-441.

Serpell, J. (1995). The domestic dog: its evolution, behaviour and interactions with people. Cambridge University Press.