"The Veterinarian's Encyclopedia of Animal Behavior" written by Bonnie V.G. Beaver and the online encyclopedia of veterinary medicine available from the Veterinary Medical Clinic can be used by aspiring veterinarians. Veterinary school libraries also typically have animal encyclopedias available for aspiring veterinarians.
The North Carolina State Veterinary Medicine school has a number of general veterinary encyclopedias available, including "The Encyclopedia of Animals: A Complete Visual Guide" by Fred Cooke, "Grzimek's Animal Life Encyclopedia" by Gale and "Magill's Encyclopedia of Science: Animal Life" published by Salem Press. Other more specialized encyclopedias for aspiring veterinarians available at this school include the "Encyclopedia of Environmental Microbiology" written by Gabriel Britton and the "Encyclopedia of Genetics, Genomics, Proteomics, and Bioinformatics" written by John Wiley & Sons.