Dr. Sharon French heads to the zoo to relieve Rowdy the lion of an infected tooth, and she'll need the assistance of Dr. Regan Williams to get him safely sedated. Will the wild feline sleep deeply for the procedure? Then, Dr. Debbie James hopes she can help a disoriented Shih Tzu named Max, who's having trouble telling which way is up. Later, Tandi the golden retriever seeks sweet relief from her itchy skin. Dr. Stephen Waisglass is clued into a likely culprit after taking some skin samples.