An Interesting Question

This happened in my final year of studies at Simon Fraser University in Burnaby (part of Greater Vancouver), BC -- and some of you have already heard about the following from me when I ranted sometime ago on msn:

When I passed outside one of the large lecture halls (K 9500), a guy was standing at the doors, holding a cute female puppy with a near bowtie placed on her top. Apparently he was waiting for his girlfriend, whom came out, took the puppy, and went off with the ever-faithful fella (and both were holding hands for obvious reasons).

The question therefore is: Which one is the bitch?

Today I am still having a difficult time determining which is which.