and what I've learned is that doctors are snakeoil salesmen and should never be trusted, and also they drink pee sometimes.
To read, maybe:
1. Animals in Art and Thought 1971
2. Images in the Margins of Gothic Manuscripts 1966
(Animals in the Middle Ages by Nona C. Flores)
This book is a collection of essays about how animals are represented in the Middle Ages. Interdisciplinary in nature, their respective authors' focus on artefacts, manuscripts, fables, marginalia, werewolves and gargoyles...
Lastly, on a whimsical note, the work of David A. Sprunger dives into animal doctors and animal patients, how they are often natural enemies (eg predator and prey) and what this tells us about doctors of the Medieval Ages. I really enjoyed reading the pages attached above...