The Data Says “Don’t Hug the Dog!” says Stanley Coren on Psychology Today, who did an Internet image search on the terms “hug dog” and “love dog” and examined 250 pictures of dogs being hugged. He found more than 80% showed signs of canine anxiety.
In all, 81.6% of the photographs researchers scored showed dogs who were giving off at least one sign of discomfort, stress, or anxiety. Only 7.6% of the photographs could rate as showing dogs that were comfortable with being hugged. The remaining 10.8% of the dogs either were showing neutral or ambiguous responses to this form of physical contact.
Dogs are technically cursorial animals, which is a term that indicates that they are designed for swift running. That implies that in times of stress or threat the first line of defense that a dog uses is not his teeth, but rather his ability to run away. Behaviorists believe that depriving a dog of that course of action by immobilizing him with a hug can increase his stress level and, if the dog’s anxiety becomes significantly intense, he may bite.