A biological study recently was published in the Scientific Report states that American scientists screened 129,778 dogs for cardiovascular data. They found that dogs born in June to August were more susceptible to cardiovascular disease than dogs born in other months. The dog's heart is considered to be an effective physiological model of the human heart because they both have extremely similar cardiovascular systems.

    Cardiovascular and cerebrovascular disease refers to ischaemia or hemorrhage in the heart, brain and systemic tissues due to hyperlipidemia, blood viscosity, atherosclerosis, and hypertension, which is currently ranks first in all causes of death.

    The researchers analyzed cardiovascular data from 253 different breeds of 129,778 dogs and found that in breeds without genetic susceptibility to cardiovascular disease, dogs born in June to August have higher risk of vascular disease than dogs were born in other months. However, the birth season does not appear to affect dogs that are already genetically susceptible to cardiovascular disease.

    The research team emphasized that because the relationship between birth season and cardiovascular disease is more pronounced in dogs without genetic susceptibility, this effect is likely due to environmental factors. One of these factors may be selective breeding, in which dogs that are susceptible to cardiovascular disease are more closely "monitored" than dogs that are less susceptible to disease. Researchers believe that there may also be genetic factors that make dogs less susceptible to cardiovascular disease are more vulnerable to the adverse environmental effects associated with the birth season.

    Dogs and humans have similar cardiovascular systems, and because they live with humans, they are also exposed to similar environmental pressures. Therefore, researchers believe that the latest findings are likely to help understand the relationship between human cardiovascular disease and its birth season.