The American Veterinary Medical Association (AVMA) has free downloadable vet science brochures. You do have the option to purchase them if you want also. There is topics from cancer in pets, external and internal parasites, euthanasia, spaying and neutering, vaccinations, and selection of different types of pets. The brochures cover different types of pets including dogs, cats, rabbits, ferrets, etc. and they also cover horses, These could potentially be a great resource in your vet science class and they are FREE!
Check out this link: http://www.avma.org/animal_health/brochures/default.asp