Caring for geriatric small-breed dogs with heart disease from home is a challenge due to the lack of technological tools available in the market, specifically in South America. This lack limits the quality of life of these canine companions and hinders early detection of cardiac problems. Heart disease is common in geriatric dogs of small and medium breeds and the lack of accurate information about their health prevents proper care. In this study, a technological solution based on an IoT device is proposed for monitoring geriatric cardiac dogs in Peru. The device allows measuring temperature and heart rate and recording electrocardiograms in real time for early detection of cardiac problems in pets. For the development of the technological solution, a methodology based on four phases was applied: (1) Analysis of IoT devices, (2) Construction of IoT devices, (3) System construction and (4...