Taylor's Ark Series by Jody Lynn Nye

Medicine and mayhem from the bestselling co-author of "Crisis on Doona." An epidemic is spreading from colony to colony in the vast reaches of space. Dr. Shona Taylor, with her team of four-legged assistants--including a dog with an immune system that can synthesize vaccines--sets out to find a way to stem the killer disease.

Dr. Shona Taylor and her highly trained menagerie must save an entire world of humans and alien ottles from dying at an alarming rate -- of old age...

In Taylor's Ark and Medicine Show, Shona Taylor fought death and disease--with a menagerie of very special assistants. Now, in an all-new novel, Dr. Taylor takes on a new assignment, and discovers a chilling reality behind a picture-perfect planet.