The behavioral and endocrinological development of stress response in dogs.
Endocrinological stress response has been shown to be absent in a specific period of the early life of rodents; this is named the stress-hyporesponsive period (SHRP). The SHRP is a significant period for the appropriate development of infants. In this study, the presence of SHRP in dogs was identified by conducting a 5-min separation test in 142 Labrador retriever puppies in their early socialization period and measuring the changes in urinary cortisol levels. An increase in cortisol after separation was found after 5 weeks of age, suggesting that the SHRP persists until 4 weeks of age in dogs. The distress vocalization during separation changed and the lactating behavior decreased rapidly around 5 weeks of age, suggesting that the endocrinological and emotional aspects of development change at approximately 5 weeks of age and maternal inhibition of cortisol might occur in dogs as well as rodents.
['Nagasawa|Miho|M|', 'Shibata|Yoh|Y|', 'Yonezawa|Akiko|A|', 'Morita|Tomoko|T|', 'Kanai|Masanori|M|', 'Mogi|Kazutaka|K|', 'Kikusui|Takefumi|T|']
D000818:Animals D004285:Dogs D004644:Emotions D006854:Hydrocortisone D007030:Hypothalamo-Hypophyseal System D008426:Maternal Deprivation D010913:Pituitary-Adrenal System D013315:Stress, Psychological
dog stress-hyporesponsive period cortisol vocalization maternal behavior