Lassie is a smart collar for dogs that detects their position and vital signs. The position safeguards the dog's safety, through GPS and GSM, activating them only if necessary, thus avoiding exposing him to unnecessary radio frequencies. The evaluation of the parameters detects the state of well-being and allows monitoring in the post-operative period. In home alone mode, under development, the device communicates with other smart devices ( water dispenser) to meet a dog's need, manifested through an alteration of vital parameters. The collar communicates with you through the App, notifying you of any alterations and allows you to share them with the veterinarian.