A device, system, and method for remotely monitoring animal health is provided. The device is secured to an ear of an animal to be monitored and has a sensor that obtains animal health data. The ear is positioned between a sensor housing and a disc, which are both secured to a post inserted through an opening in the ear. The device includes a spring that causes the disc to be biased toward the ear in order to maintain a snug fit to obtain consistent and accurate reading from the heart rate sensor. The spring allows for animal growth so that the device may be fitted to a young animal and may remain in place for the duration of the life of the animal.
