Just to let you know, total expenses (tuition and fees) for these schools are Tennessee at $40,724 and Michigan State at $43,054. You might want to check out cost-of-living estimates for the area to see if one school can allow you to get significantly cheaper rent, utilities, etc. than the other. Even a $15,000 total difference in cost will seem a loooot bigger once you start paying off loans.
Since you want to go into small animal medicine, I think you'll get comparable experiences at either school. If you're really torn, just start asking yourself some questions. They're both kind of far from home, but is one easier/faster to get to than another if you need to see family? Do you like lots of cold weather and snow? Larger or smaller class-size? More integration of problem-based learning or sticking with traditional lectures?
Good luck with your decision!!!