Optimism Index in Dogs

Photo Credit: © B.Stefanov / Fotolia

Dogs generally seem to be cheerful, happy-go-lucky characters, so you might expect that most would have an optimistic outlook on life.

In fact some dogs are distinctly more pessimistic than others, research from the University of Sydney shows.

"This research is exciting because it measures positive and negative emotional states in dogs objectively and non-invasively. It offers researchers and dog owners an insight into the outlook of dogs and how that changes," said Dr Melissa Starling, from the Faculty of Veterinary Science. Her PhD research findings are published in PLOS One today.

"Finding out as accurately as possible whether a particular dog is optimistic or pessimistic is particularly helpful in the context of working and service dogs and has important implications for animal welfare."

Dogs were taught to associate two different sounds (two octaves apart) with whether they would get the preferred reward of milk or instead get the same amount of water. Once the dogs have learnt the discrimination task, they are presented with 'ambiguous' tones.

If dogs respond after ambiguous tones, it shows that they expect good things will happen to them, and they are called optimistic. They can show how optimistic they are by which tones they respond to. A very optimistic dog may even respond to tones that sound more like those played before water is offered.

"Of the dogs we tested we found more were optimistic than pessimistic but it is too early to say if that is true of the general dog population," said Dr Starling.

However it does mean that both individuals and institutions (kennels, dog minders) can have a much more accurate insight into the emotional make-up of their dogs.

According to the research a dog with an optimistic personality expects more good things to happen, and less bad things. She will take risks and gain access to rewards. She is a dog that picks herself up when things don't go her way, and tries again. Minor setbacks don't bother her.

If your dog has a pessimistic personality, he expects less good things to happen and more bad things. This may make him cautious and risk averse. He may readily give up when things don't go his way, because minor setbacks distress him. He may not be unhappy per se, but he is likely to be most content with the status quo and need some encouragement to try new things.

"Pessimistic dogs appeared to be much more stressed by failing a task than optimistic dogs. They would whine and pace and avoid repeating the task while the optimistic dogs would appear unfazed and continue," said Dr Starling.

"This research could help working dog trainers select dogs best suited to working roles. If we knew how optimistic or pessimistic the best candidates for a working role are, we could test dogs' optimism early and identify good candidates for training for that role. A pessimistic dog that avoids risks would be better as a guide dog while an optimistic, persistent dog would be more suited to detecting drugs or explosives."

Dr Starling has been working with Assistance Dogs Australia, a charity organisation that provides service and companion dogs to people with disabilities, to investigate whether an optimism measure could aid in selecting suitable candidates for training.

The research not only suggests how personality may affect the way dogs see the world and how they behave but how positive or negative their current mood is.

"This research has the potential to completely remodel how animal welfare is assessed. If we know how optimistic or pessimistic an animal usually is, it's possible to track changes in that optimism that will indicate when it is in a more positive or negative emotional state than usual," said Dr Starling.
"The remarkable power of this is the opportunity to essentially ask a dog 'How are you feeling?' and get an answer. It could be used to monitor their welfare in any environment, to assess how effective enrichment activities might be in

Citation
Starling MJ,  Branson N, Cody D, Starling TR, McGreevy PD. 2014. Canine Sense and Sensibility: Tipping Points and Response Latency Variability as an Optimism Index in a Canine Judgement Bias Assessment. PLoS ONE, 2014; 9 (9): e107794 DOI: 10.1371/journal.pone.0107794

Dogs and herders in southern Africa

Photo Credit: Johan Gallant

The geographical origin for the domestic dog is probably Eurasia. While modern dogs may have had a single origin about 15,000 YBP, earlier paleodogs may have been present 33,000 YBP. Dogs in sub-Sahara Africa therefore are most likely to be recent invaders from Eurasia. Currently, the oldest archaeological evidence for the presence of domestic dogs in Africa comes from about 7000-6000 YBP (the Neolithic of Egypt’s Western Desert and along the Nile in Egypt and Sudan). However, dogs do not appear to be widespread or common in African archeological sites until about 1000 YBP. This may be the result of confusion distinguishing between dog remains and jackal remains, or a more recent introduction of dogs.

In a new paper, Peter Mitchell (2014) of Oxford University follows up on an earlier paper on dog use by pre-colonial herders in southern Africa. Mitchell notes that dogs were one of several domestic animals kept by south African herders, but their economic and social relevance is poorly known. He reviews the evidence for the dog’s introduction into southern Africa and assesses the relative strengths of various lines of evidence (osteology; ancient DNA; animal tracks; faunal taphonomy) to identify those instances where the presence of dogs can most convincingly be established on sites used by herders.

The study reports skeletal evidence for herder-associated dogs comes from a handful of sites in the western half of South Africa, Namibia and, possibly, Botswana. A review of previous studies noted the strongest evidence is a nearly complete human burial in a shell midden at Cape St Francis on the Indian Ocean coast (dated 1150 ± 40 YBP) found with the skeleton of a small dog in the lap of the human skeleton. Other evidence suggests dogs have been present in the western regions of southern Africa since about at about the same time. Mitchell suggests that herder communities in the Cape acquired dogs through some exchange-mediated process of diffusion sourced ultimately to farmers in the eastern third of South Africa.

The first documented observation of dogs in southern Africa was made by Vasco da Gama and dates to 7 November 1497 when the Portuguese explorer observed people who were probably hunter-gatherers with dogs. Most observations of dogs with Khoe-speaking herders postdate the onset of Dutch colonization of the Cape in 1652. The dogs were medium height with short hair, long muzzles, and ears that could be erect and pointed or drooping. Analysis of skeletons buried at Zerrissene Mountain and Cape St Francis supports this description. These dogs were small, and more gracile overall than those found at agro-pastoralist sites in the Shashe-Limpopo Basin.

Some commentators suggest that the Khoe-speakers did not value their dogs highly, noting they were few in number and scrawny, and not cared for. But, in 1731 Peter Kolbe wrote more extensively about these people and considered the dogs well taken care of. Dogs of the Korana speaking people were larger and varied from grey to white to brown in color, but interbreeding with dogs introduced to South Africa by Europeans cannot, perhaps, be excluded. Korana dogs were also well treated. They were feed meat and milk.

Mitchell proposes dogs in used by herding cultures acted as companions, guard dogs, defenders of livestock, and as aids in hunting. While the Damara in north-central Namibia apparently ate dogs, there is no evidence to support this in the other cultures. Dogs also played a role in the belief systems of these peoples, to at least a limited degree.

Hendrik Wikar led an expedition to the north of the Cape Colony in the 1770s, and recounts the story of a group of women who chose to sleep on an elephant trail close to a river. Not having dogs with them, and having chosen not to light a fire, two were trampled to death by a passing elephant. Dogs could also alert their human companions to human enemies, Jan van Riebeeck describes this in early conflicts between the Cape Khoekhoen people and the Dutch East India Company in 1659. Dogs also alert people to the presence of predators of livestock. Today in Kenya, for example, annual livestock losses to predators are in the range of 1-6 %, though this understates their possible significance to individual owners.

European farmers in the 19th and 20th centuries employed shooting, traps and poisons to control jackals and reduce their attacks on sheep, precolonial herders must necessarily have depended more heavily upon dogs. Kolbe wrote about this in 1731 and describes how the Khoe-speakers would release dogs at night to guard livestock.

Mitchell suggests when and how dogs came to be part of the lives of southern African herders merits more research. Noting that it might be productive to look at the taphonomy of other faunal assemblages where sheep are prominent to see if there is evidence for canine-induced modification. Sheep do not travel by themselves, they needed to be looked after. Previous authors have proposed that dogs and livestock spread together in the Neolithic Sahara. And, it seems likely that success in a carnivore-rich African landscape would have been very difficult without the help of the dog.

Today, dogs are being used in southern Africa to protect sheep from local predators. There is a dual benefit because the dogs guard the sheep from the endangered cheetah and protect the cheetahs from being shot by the farmers. Anatolian sheep dogs are being used for this purpose. However indigenous dogs are still present in southern Africa, they are free-ranging and still exhibit behaviors involved in guarding livestock. For more on indigenous African dogs see the AfriCanis website; The story of the African Dog by Johan Gallant. And, SOS Dog, The purebred Dog Hobby re-examined by Johan and Edith Gallant.  

Citation

Mitchell, P. (2014). The canine connection II: dogs and southern African herders. Southern African Humanities, 26, 1-19.

Free-ranging dogs in India, daily activity

Indian Pariah Dog, Central India 

Many countries, both developed and developing have large populations of free-ranging dogs, notably Mexico, Ecuador, Zambia, Zimbabwe Italy, India, Nepal and Japan. Free-ranging dogs are a ubiquitous part of the urban ecology in these counties and others. However, dogs in India have lived outside of human homes for centuries and been used for hunting. Dog figurines and remains have been unearthed in the Indus Valley Civilization and references to dogs can be found in ancient Indian texts like the Rg Veda, the Puranas, the Mahabharata, the Ramayana and the Manu Samhita. Dogs are also present in many folk tales from across the country. The Hindu culture considers dog outcasts, associated with death and evil. However householder’s that have dogs outside their house have the daily duty feeding the dogs and outcasts. While the European influence has introduced pedigreed dogs to the homes of the middle class and elite society, the Indian pariah dog has continued to live on the streets, depending on garbage and begging for food.

In a recent paper Majumder et al. (2014) study free-ranging dogs, noting very little is known about the ecoethology and most of what we know about dog behavior is based on studies of pets reared by humans. The free-ranging dogs lead a scavenging life, depending on human excesses for their survival, and rarely hunt. They are often considered a menace by many people, as dirty animals that bark, bite and spread rabies. These notions are often founded on personal biases and little scientific data exist to either support or refute such claims. As part of an extended study on the behavioral ecology of free-ranging dogs in India, they carried out random sampling of dog behavior through censuses in two cities and one township of India. Data from 1941 sightings provided the basis for a time activity budget of dogs during the part of the day when they share the streets with humans.

The analysis revealed that the dogs are inactive for over half of the day, either sleeping, lazing or just sitting. Sampling was done only during the time when dogs could actually be seen on the streets, and were not hiding in shelters, so the authors suggest this is actually an underestimate. Their results match the observations on free-ranging dogs in Berkeley, California, USA, in which repeated sampling were carried out in a 48 ha residential area for seven months. In this study, 1243 sightings were made on about 50 unique free-ranging dogs, which were found to be resting in 44.4% of the sightings. This study also reported that free-ranging dogs were most abundant in the early mornings and late afternoons, with the percentage of dogs found to be resting increasing with temperature, for an observed temperature range of 9–29⁰C. Though temperature was not recorded during this study, the temperature range during observations was 8–36⁰C, considering all the time periods and the three locations covered. When the dogs were not resting, they were most often seen to be walking. Since the sampling was based on random sightings, the purpose of walking was unknown. Dogs typically walk in search of food, and also for marking their territories. Interaction rates were quite low, and all recorded instances of interaction with humans were submissive. Thus, this analysis does not support the general notion of free-ranging dogs being aggressive, unfriendly animals that are a constant source of nuisance to people on the streets of India.

Dogs bark and howl, often producing a chorus reminiscent of their wolf ancestors, and this makes them an irritant with many humans. Many encounters between dogs are often interrupted by people who chase them away, often by throwing stones or dousing them with water. Dogs were sighted producing sound in only 65 cases, which was 3.34% of the total observations. Thus, the perception of dogs as noisy and aggressive creatures that present a threat to human well-being is quite biased.

However, it is true that many dogs in the Indian streets are rabid, and dog bites do occur, though these are not regular incidents as perceived by some. Dogs are efficient scavengers, and are responsible for removing of a large volume of garbage from the streets. While this preliminary study suggests that the general perception of these dogs as a nuisance is quite flawed. The authors argue that the solution to dog–human conflict is not culling, but efficient management of garbage and rabies in the country, and a positive attitude towards dogs.

Citation

Majumder SS, Chatterjee A, & Bhadra A. (2014). A dog’s day with humans–time activity budget of free-ranging dogs in India. Current Science, 106(6), 874.

Dogs Jealous?

Jealousy is usually thought of as being unique to humans, in part because of the complex cognitions often involved in this emotion. However, from a functional perspective, one might expect that an emotion that evolved to protect social bonds from interlopers might exist in other social species, particularly one as cognitively sophisticated as the dog.

Harris and Prouvost (2014) experimented using a paradigm from human infant studies to examine jealousy in domestic dogs. They found that dogs exhibited significantly more jealous behaviors (such as snapping, getting between the owner and object, pushing/touching the object/owner) when their owners displayed affectionate behaviors towards what appeared to be another dog as compared to nonsocial objects.

When their owners showed affection toward a stuffed dog, the real puppies in the study responded by snapping or pushing the stuffed dog aside. This jealous streak only surfaced when owners were attending to the stuffed dog and not when they were occupied with random objects. However, this was no ordinary stuffed dog: It was engineered to bark, whine and wag its tail convincingly.

Since jealously is generally believed to be an emotion that requires more complex thinking, the researchers suggested there could be a more basic form of jealousy specific to dogs and some other social animals that helps protect their bonds and ward off outsiders.

"Many people have assumed that jealousy is a social construction of human beings -- or that it's an emotion specifically tied to sexual and romantic relationships," study co-author Christine Harris, a psychology professor at UCSD, said in a university news release. "Our results challenge these ideas, showing that animals besides ourselves display strong distress whenever a rival usurps a loved one's affection."

As for whether the puppies in the study viewed the stuffed dog as an actual rival, the researchers pointed to this result as evidence that they did: 86 percent of the puppies sniffed the stuffed dog's rear end.

The study, published July 23 in the journal PLOS ONE, involved 36 puppies. Each dog was just 6 months old. All of the puppies were tested separately and videotaped.

During the test, owners were told to ignore their dog and turn their attention to three different objects. First, the owners attended to the realistic-looking stuffed dog. Then they focused on a pail. The third object in the test was a book.

In observing the dogs' behavior, the researchers looked for signs of aggression, attention-seeking and interest in their owner or the objects. The test was designed to help the researchers determine if the dogs felt an emotion similar to jealousy, or if they were just generally annoyed when they lost their owners' attention.

The dogs demonstrated more jealous behaviors when their owner focused on the stuffed dog than when their owner paid attention to the other objects, the study found. These behaviors included trying to come between their owner and the stuffed dog, pushing their owner and snapping when the owners displayed affection toward the stuffed dog.

The researchers concluded a form of primitive jealousy that exists in babies may also exist in at least one other social animal: dogs. This emotion, the study's authors suggested, may have evolved to help infants compete for resources from their parents, including food, attention, love and care.

Citation

Harris CR, Prouvost C (2014) Jealousy in Dogs. PLoS ONE 9(7): e94597. doi:10.1371/journal.pone.0094597