Veterinary Assistant Job Description. CLEAN, CLEAN, CLEAN—until cleanliness is quick and superb, there is no time to learn anything else. Clock in by 8:20 AM. Check on animals in back. Ask Sr. Assistant if you need to do anything special for animals in hospital, like give meds. Walk, water and feed (Walk, clean cages, feed/water). If Sr. staff is here, and lots of critters are here, see if she wants you to walk or clean/water/feed. Restock exam r...