Human uses of mammals that "one is well advised to study the behaviour rather than attempting to get at any underlying emotion". Charles Darwin however had accepted the idea of emotion in animals, writing his 1872 book "The Expression of the Emotions in Man and Animals" on the subject. Darwin believed that mammals had social, mental and moral lives. In "The Descent of Man" (1871), he wrote: "There is no fundamental difference between man and the higher mammals in their mental faculties." Biologists remained wary of the idea, even for the great apes, but this led to serious difficulties, as Donald O. Hebb explained
Body language of dogs position of the ears. It has been found that dogs that make eye contact with the trainer, as well as display a forward ear position, are most successful in learning achievement during operant conditioning. Body language of dogs The body language of dogs is one form of non-verbal communication whereby dogs can express emotions and intentions through bodily movements. It refers to the interpretation of posture and behaviour of species in the genus Canis. This form of visual communication is generally used for identifying emotions and intentions of domestic dogs, though it can also be applied to wild canines such