UPenn has a great list of free and paid Veterinary Apps!
Core Textbooks in Veterinary Medicine (note: a mix of print and electronic items)
Veterinary Medicine eBooks (incomplete list!)
MU Libraries has millions of eBooks!
In MERLIN, the library catalog, eBooks have "[electronic resource]" in the title, and you'll see an "eBook" icon on the results page.
In MERLIN's Advanced Search, you can limit the "Material Type" to Ebooks.
And, it's not just "veterinary" ebooks. We've got 1,000s of ebooks in human medicine and basic sciences
See core electronic textbooks in the Health Sciences by subject
The University of Georgia has posted several FREE ebooks to iTunes.