A 2006 study from the journal Physiology & Behavior found that during their first three days in a shelter environment, dogs had three times the level of cortisol in their system than normal ...

However, there is a limit to the possible physical variance of dogs. All dog physiology, from Chihuahua to Great Dane, is based on the body-plan of the ancient wolf’s foetus. This is known as ...

“We found that dogs at high genetic risk of obesity were more interested in food,” said Natalie Wallis in the University of Cambridge’s Department of Physiology, Development and ...