First the dog was really excited because she thought she was going for a car ride. Then she was even more excited because she got to go to a new place where there were other dogs! Other dogs to play with!
And then she was excited to go into a back room to see new people! New people to play with! It was the best day of her life, ever!
Then they gave her anesthesia and took out her ovaries and uterus.
And she was sad Charlie Brown for the rest of the night.
*btw, why is it that this is known as the sad charlie brown pose, yet I cannot find any actual images of charlie brown doing this? google failed me.