Without treatment, heartworms can block blood flow to the heart causing cardiovascular collapse and death. (petbusiness.com)
As the disease further progresses, signs of heart failure ensue, including worsening respiratory signs and cough, swollen belly and in worst cases «caval syndrome», which is a form of cardiovascular collapse. (blog.nhvnaturalpetproducts.com)
Severe cases could lead to death from cardiovascular collapse. (thedogplace.org)