Pies: Dogs can use their sense of smell to

Evidence: 64 • authority: 72

The dog sense of smell is the most powerful sense of this species, the olfactory system of canines being much more complex and developed than that of humans. It is believed to be up to 10 million times as sensitive as a human's in specialized breeds. Dogs have roughly forty times more smell-sensitive receptors than humans, ranging from about 125 million to nearly 300 million in some dog breeds, such as bloodhounds. These receptors are spread over an area about the size of a pocket handkerchief (compared to 5 million over an area the size of a postage stamp for humans). Dogs' sense of smell also includes the use of the vomeronasal organ, which is used primarily for social interactions. The d…

Evidence: 52 • authority: 92

Not just avoidance: dogs show subtle individual differences in reacting to human fear chemosignals.. Recent olfactory studies suggest that human emotional chemosignals can alter dog behavior. However, their methods impeded a firm conclusion on whether dogs reacted to the scent directly or to the present human's unconscious response to the intraspecific stimulus. Moreover, whether these reactions differ between dogs has not yet been explored. Therefore, we investigated dogs' reactions to human fear or neutral chemosignals while shielding the present human from the smells. Dogs were first trained to approach a single empty target on command, before they were given the choice between two targe…

Evidence: 57 • authority: 72

The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of wolves. Also called the domestic dog, it was selectively bred during the Late Pleistocene by hunter-gatherers. Dogs and the modern gray wolf share a common ancestor. Dogs were the first species to be domesticated over 14,000 years ago, before the development of agriculture, though genetic studies suggest the domestication process may have begun over 25,000 years ago. Due to their long association with humans, dogs have gained the ability to thrive on a starch-rich diet that would be inadequate for other canids. Dogs have been bred for specific behaviors, sensory abilities, and physical traits. Dog breeds va…

Evidence: 47 • authority: 72

Dog communication refers to the methods dogs use to transfer information to other dogs, animals, and humans. Dogs may exchange information vocally, visually, or through smell. Visual communication includes mouth shape and head position, licking and sniffing, ear and tail positioning, eye contact, facial expression, and body posture. Auditory communication can include barks, growls, howls, whines and whimpers, screams, pants and sighs. Dogs also communicate via gustatory communication, utilizing scent and pheromones. Humans can communicate with dogs through a wide variety of methods. Broadly, this includes vocalization, hand signals, body posture and touch. The two species also communicate v…

Evidence: 47 • authority: 72

Dog intelligence or dog cognition is the process in dogs of acquiring information and conceptual skills, and storing them in memory, retrieving, combining and comparing them, and using them in new situations. Studies have shown that dogs display many behaviors associated with intelligence. They have advanced memory skills, and are able to read and react appropriately to human body language such as gesturing and pointing, and to understand human voice commands. Dogs demonstrate a theory of mind by engaging in deception, and self-awareness by detecting their own smell during the "sniff test", a proposed olfactory equivalent to the mirror test.

Evidence: 38 • authority: 92

Dogs (Canis familiaris) distinguish conspecific emotional chemosignals.. Emotional communication facilitates social interactions among animals. While dogs can discriminate and exhibit context-appropriate behaviors in response to odor samples from stressed and non-stressed humans, their capacity to differentiate emotional odors from conspecifics-and the broader function of these cues in intraspecific communication-has not been investigated. Using a habituation-discrimination paradigm, 43 dogs were presented with odor samples from an unfamiliar dog collected after events marked as joyful, stressful, and baseline (relaxing). Subjects showed longer investigation time for novel versus repeated o…

Evidence: 33 • authority: 80

What dogs ‘see’ when they smell something

Evidence: — • authority: 72

A free-ranging dog is a dog that is not confined to a yard or house. Free-ranging dogs include street dogs, village dogs, stray dogs, feral dogs, etc., and may be owned or unowned. The global dog population is estimated to be 700–900 million, of which approximately 75% are classified as free-ranging. Free-ranging dogs are common in developing countries. It is estimated that there are about 62 million free-ranging dogs in India. In Western countries free-ranging dogs are rare; in Europe they are primarily found in parts of Eastern Europe, and, to a lesser extent, in parts of Southern Europe. Free-ranging dogs survive by adapting to their environment, including scavenging through uncollected…

Evidence: — • authority: 72

A phobia is an anxiety disorder, defined by an irrational, unrealistic, persistent and excessive fear of an object or situation. Phobias typically result in a rapid onset of fear and are usually present for more than six months. Those affected go to great lengths to avoid the situation or object, to a degree greater than the actual danger posed. If the object or situation cannot be avoided, they experience significant distress. Other symptoms can include fainting, which may occur in blood or injury phobia, and panic attacks, often found in agoraphobia and emetophobia. Around 75% of those with phobias have multiple phobias. Phobias can be divided into specific phobias, social anxiety disorde…

Evidence: — • authority: 72

Olfactic communication is a channel of nonverbal communication referring to the various ways people and animals communicate and engage in social interaction through their sense of smell. The human olfactory sense is one of the most phylogenetically primitive and emotionally intimate of the five senses; the sensation of smell is thought to be the most matured and developed human sense. Human ancestors essentially depended on their sense of smell to alert themselves of danger such as poisonous food and to locate potent mating partners. Using the sense of smell as an instrument paved a way for smell to become a platform of nonverbal communication. Smell also has a significant influence on soci…

Evidence: — • authority: 72

Fear is an emotional state which is aroused by threatening situations. It is usually considered to be a negative, unpleasant emotion. The feeling of fear can result directly from certain kinds of sensory stimulation, such as sounds which resemble screaming. Fear can also be evoked by the anticipation that undesirable events will, or may, occur, and is useful in providing motivation to avoid or mitigate risks. It may also be the result of imagining threats to oneself or others, whether or not those threats are real or possible. Fear is associated with a number of physiological states. In humans, fear is correlated with more rapid breathing and heart rate, dilation of the pupils, spikes in co…

Evidence: — • authority: 80

Brain scans provide world-first evidence dogs can distinguish between human fear and sadness