The present invention provides an imaging system having an imaging device for imaging at least a portion of an animal said imaging device selected from a group consisting of X-ray computed tomography (CT), positron emission tomography (PET), single-photon emission computed tomography (SPECT), fluorescence and phosphorescence microscopy (FPM) and any combination thereof consisting of CT, computer-assisted tomography IR, rendered images comprising infrared light spectroscopy PET, positron emission tomography fluorescence and phosphorescence microscopy, a Raman spectroscopic imaging system, ultrasound and any combination thereof.