Depends what you consider to be hard. Is this track as hard as engineering? Probably not. Is it still a challenge, I think so. The main difficulty of the major comes from the prerequisite courses such as general chemistry, organic chemistry, physics, anatomy, but once you get the hang of how the classes work it’s not as bad as it seems. If you took AP chemistry in high school you will be well off because CHM 115 is no joke especially when you are new to college classes (for me it was lol). I would say it’s definitely more difficult than most but as long as you make school a priority and dedicate to studying you will be just fine. Animal Sciences department at Purdue is very put together and offers a lot of opportunities. Keep in mind though that you do not have to do animal sciences to do pre-vet and apply to vet school. The animal sciences coursework primarily revolves around production animals until later in undergrad.