If I remember correctly...
Mizzou had 4 questions? What makes you unique, why vet med, ethical question (animal use in teaching/research), and I forgot what the other one was.
Obviously you address what makes you special and the why vet med in your PS, but most people feel like there isn't enough room in the PS. SOV is right-- use the space to your advantage! I told a story about getting mauled by a cat in one of mine. It didn't make the cut for my PS, but it was a good story for the message I was trying to send.
Sure I said similar things, but the message is the same regardless of what you're writing about-- I am someone who will make a good veterinarian, so let me into your school. Keep reiterating that in as many ways as you can.