Answer:
I'm not sure about the donkey kong one but for the dog food one they see the reactions of dogs. They might have a human tester but i'm pretty sure no one would think dog food is good.
Write about:
A) Why you want to be a veterinarian
B) How you plan to accomplish your goal (your path to success)
Honesty taking care of patient needs and good infection control
In anatomic position with slight medial rotation
hope this helps!