The Jindo dog, also called the Korea Jindo dog and Korean Jindo, originated from Jindo Island off the southwest end of the Korean Peninsula, but is now found all over Korea [5-7,10]. It is a medium-sized Asian spitz breed and comes in a variety of colors such as white, fawn, red, black, black-and-tan, tiger stripe, salt-and-pepper, and spotted. Fawn and white are the most prevalent coat colors [7,10]. The height range is 45~53 cm, the weigh range is 16~22 kg, and this breed has bright eyes, erected ears, and rolled or sickle-shaped tails with acute hearing and sense of smell [5,10]. The Jindo dog is well-known as a hunting and watch dog, and in addition it is celebrated for its high-spirit, intelligence, bravery, and loyal nature with a smart appearance and whole-hearted devotion to its owner [6,10]. They are also praised for their hygiene, easy house training, very kind and faithful temperament toward their owners, and rarely barking in familiar environments. Nowadays, the Jindo dog is kept as an affectionate companion dog. In 1962, the Korean government designated the Jindo dogs as natural monument No. 53, a title which is given to animals, plants, minerals, caves, geological features, biological products, and special natural phenomena that carry great historic, cultural, scientific, aesthetic, or academic values [6,7,10]. In 1967, 'The Jindo Preservation Ordinance' was established by law and 'Jindo Dog Research and Testing Center' was founded to actively preserve the breed in 1999. The Center evaluates 6-month-old puppies and if the puppy is deemed to meet the breed standard, then it is micro-chipped and registered, then managed under the auspices of the Korean government [10]. In 2005, the Jindo dog was registered in the Federation Cynologique Internationale (Belgium) as the Korea Jindo dog and in the Kennel Club (UK) as the Korean Jindo [6,7,10].

The number of households with companion dogs has increased since 2000, and approximately one in six households has more than one dog. The Jindo dog ranked 8th in the list of canine breeds kept as pets, falling behind other foreign breeds, and was found in only 4% of households that had a pet dog [8].

Undesirable or inappropriate canine behavior in domestic dogs causes great distress in owners, and is likely to destroy the owner-dog bond [3]. Furthermore, behavior problems represent the single most serious risk factor of pet relinquishment, and approximately 50% owners give up their dogs because of canine behavior problems [14,16]. A study on canine behavior problems in Seoul also determined that relinquishment and abandonment was significantly associated with demonstration of behavior problems [8].

This study was aimed to evaluate the reasons of relinquishment of the Jindo dog regarding behavior problems and association with various factors such as the dog's gender, sterilization status, age, housing condition, and amount of exercise and/or training per day. Additionally, the five most common behavior problems such as 'excessive vocalization', 'destructive behavior', 'excessive excitability', 'inappropriate elimination', and 'aggressive behavior' were evaluated in the Jindo dog.

Canine behavior problems are collectively the single greatest risk factor of relinquishment of dogs according to many studies [1,8,9,14,15]. We therefore hypothesized that the relinquishment of Jindo dogs would be related to behavior problems. Thus, the questionnaires in our study mainly asked about the behavior problems of the Jindo dog, and the purpose of this study was to evaluate effects of behavior problems on Jindo dog relinquishment. Our results indicated that behavior problems were not a significant risk factor of the relinquishment of Jindo dogs. Consequently, the causes of relinquishment might be affected by some other factors except behavior problems.

In general, the age of the dog is significantly associated with behavior problems and relinquishment, and younger than two years old tend to show more behavior problem [8,14,15]. However, we found that age did not affect the appearance of behavior problems and subsequent relinquishment of the Jindo dog. Typically, sterilization status is a risk factor for behavior problems [4] and over 50% dogs showing behavior problems are intact males [9]. Nevertheless, sterilization status was not significantly associated with behavior problems in the Jindo dog. Mondelli et al. [12] found that male dogs showing behavior problem are at great risk for being returned to a rescue shelter. However, this study determined that there was no association between gender and demonstration of behavior problems. In the Jindo dog, the demonstration of behavior problems was not significantly affected by gender, but relinquishment was significantly associated with gender. It was noted that the dogs associated with relinquishment were all intact males while no female were associated with relinquishment. No study has been performed about gender-based preference of dog adoption in Korea. Nevertheless, it seems that Koreans tend to prefer females because of animal's temperament and ability to produce offspring. Thus, female Jindo dogs are about 30~50% more expensive than males in the Korean pet market. This may influence the gender differences in relinquishment frequency.

According to previous studies, there is no significant association between housing conditions, demonstration of behavior problems, and relinquishment [18], however having a house with a yard, garden, or a terrace is very important for better management of dogs and can influence the length of the adoption period [13]. In another study, the relinquishment is significantly associated with time dedicated to exercising and/or training per day in Korea [8]. In this study, Jindo dogs that were provided with insufficient time for exercise and/or training per day were likely to be at risk of relinquishment(p < 0.05). Dogs are social animals which needed complex animate or inanimate stimulation such as social contact, playing, walking, and training [17,18]. Play and exercise sessions should be a part of the daily routine, and insufficient play or stimulation can be an underlying cause for many behavior problems. If dogs are not provided with sufficient mental and/or physical stimulations, they are less trainable and showing behavior problem which results in relinquishment [9,14]. As a high-energetic hunting breed, the Jindo dog requires sufficient exercise and/or training to consume its abundant energy. This will also contribute to strengthening the owner-dog bond and prevent relinquishment. When people are interested to adopt a dog as a pet, they consider appearance and behavior characteristics of the dog breed. To live a better life with their own pet and prevent relinquishment, it is important to understand the innate behavior characteristics of dog breed and the potential causes of relinquishment. All breed of dog has their own behavior characteristics, and it could be developed into unwanted behavior problems when environment does not satisfy animals' needs. Most of the dog breed has potential behavior problems, for better understandings of Jindo dogs, we evaluated behavior problems based on owner's survey. In this study, the behavior problem most frequently demonstrated by the Jindo dog was 'excessive excitability'. This problem is common among dogs with abundant energy, and is often seen in hunting or working breeds [11]. If environmental stimuli and/or sufficient exercise and training are limited, the Jindo dog is likely to show 'excessive excitability'. 'Excessive vocalization' as the second most behavior problem of the Jindo dog also represented a large portion of reported behavior problems, and many owners complain about 'excessive vocalization' to behaviorists. In general, 'excessive vocalization' is associated with older dogs, insufficient environmental stimuli, and 'hyperactivity' without any medical reasons [1]. In the Jindo dog, age was not significantly associated with the demonstration of 'excessive vocalization'. However, it was hypothesized that 'excessive vocalization' might be related with 'excessive excitability' in the Jindo dog. Excessive vocalization and excitability might be induced by hyper-sensitivity to social stimuli such as novel objects, other animals, sounds, and unfamiliar people. Kim et al. [6] reported that the daily socialization program applied to Jindo dog puppies from the 7th to 13th week after birth shows significant effects not on social reactions towards humans and other dogs or fearful reactions towards social stimuli, but on playful reactions towards novel stimuli and other dogs. In order to minimize the Jindo dogs' sensitivity to various stimuli and make them more sociable and friendly toward people, especially unfamiliar men, many trials are being conducted to apply socialization programs starting from an early age [6].

Quite a few Jindo dogs have been described as demonstrating 'aggressive behavior' because 'aggressive behavior' towards people might lead to death or serious injuries, and this behavior problem is considered to be the most serious behavioral-related reason for relinquishment and euthanasia [2,14,16]. Dog bites have received much attention as a public danger as well as a current major public health issue [13].

The Jindo dog originated from an isolated island with a harsh environment. To survive under these conditions, they had to be energetic, watchful, alert, fearless, loyal, and obedient. Since owners have tried to maintain these original qualities [10], it is well-known that the typical Jindo dog generally gives its devotion whole-heartedly to its owner, but seems to resent being touched by individuals it does not know and will not show affection towards a stranger [6,10]. Some subjective descriptions of Jindo dog temperament have been reported, and they indicate that dogs of this breed, as a rule, are not friendly towards strangers [10]. For these reasons, the Jindo dog is suitable for being a watchdog and hunting dog. These are the Jindo dog's basic characteristics, so owner rarely recognize then as behavior problems per se. However, the dog's characteristics can be risk factors for relinquishment [10].

The survey research is one of the limited methods, therefore more detailed questionnaires or various research methods would be needed for future studies for better understandings of Jindo dogs. In conclusion, canine behavior problems known collectively as the single most serious risk factor for relinquishment was not significantly associated with relinquishment of the Jindo dog.