Animals under study are commonly affected by experimental conditions. Moreover, research often goes towards relatively invasive questions, which leads it to adopt invasive methods. For instance, the vascular structure of the brain is a popular topic in research. If we want to follow the blood flow in order to analyze the brain activity, we are forced to adopt invasive techniques, such as the fMRI, which require the animal to be restrained or anesthetized. It is well known that anesthesia affects the acquisition of physiological data such as the heart rate, the breath rate, and the gut movements, as well as restraining the animal.