As a registered nurse I understand that students want to do the hands on in order to  participate in the care of the human/animal.  However, one needs to understand the  anatomy/physiology/pharmacology etc and study of medicine before actually putting "hands on".  I am also an animal lover who has spent a lot of time at vet offices.  There is no way I would want a first, second or even third year student taking care of my pet .  I'm not sure why this is even a question .  I strongly believe that only 4th year students should be able to care for animals under the supervision of a licensed vet.