Ahem... just no. The anatomy of different animals varies greatly, you have several different types of digestive systems to start with, such as ruminant vs monogastrics, and each of them work completely differently. Each has species distinct diseases and ailments. You have to know the standard ranges for things like heart rate, temperature, respiration rate, gestation etc, as well as what dose rates of things to use and even what medications can be used in which species (give the wrong meication in some cases and it has disasterous consequences). How many doctors do you know that do surgery, dental work, podiatry, lameness workups, obstetrics, paediatrics, oncology, chiropractic work, pathology and all things inbetween on a day to day basis? Sure, some vets will specialise, but for the most part veterinarians are doing all of the above things and more if they work in mixed practice (maybe not so much those that work in swanky city clinics...).
Yes, getting into medicine is insanely competitive. I will agree with you there. But so is getting into vet science.