Living Proof

The other night, at a bar, I heard this story from a stranger, a friend of a friend, named Brian:
Brian's friend, we'll call her Sarah, was taking care of her friend's dog while she was away in the Bahamas. So Sarah went over to the apartment one afternoon to check on the dog. When she got to the apartment, she couldn't find the dog. She looked everywhere: she couldn't find the dog; she couldn’t find the dog; she couldn't find the dog. Finally, she found the dog. The dog was lying underneath the bed, dead.
Sarah didn't know what to do. She called a company in New York that specializes in freezing pets for up to two weeks after death. Sarah decided to take the dog to the repository until the owner came back from the Bahamas.
This proved to be problematic: how is she going to get the dog uptown to the freezing company? The dog was apparently very big and heavy, dead weight. So Sarah put the dog in a suitcase, on wheels, and dragged it to the train station.
At the train station, she was having a difficult time getting the suitcase down the stairs, as the dog was quite heavy. A man approached her and offered his assistance in bringing the suitcase down the stairs. Sarah accepted the favor and let the man help her down the stairs with the suitcase, which contained the dead dog. "This thing sure is heavy! What do you have in here?" he asked her.
Sarah didn't know what to say so she told him it contained everything she owned. The man took one look at Sarah, who was at that point quite frazzled, grabbed the suitcase and ran off into the night, dead dog in tote.

Now. The details of this story are rather hazy. It was told in a loud bar, as a second-hand account. I filled in a few of the details myself; I assigned a name to the girl who was house sitting for her friend on vacation. I don’t know the name of the dog or what kind of dog it was. Additionally, I was unable to find any such company in New York that specializes in dead pet freezing, which makes me wonder where exactly “Sarah” was going with her suitcase that contained the dead dog. What train station was “Sarah” at when her suitcase, containing the dead dog, was stolen by a man obviously strapped for cash? This story went from a second-hand (Brian) account to a third-hand (me). Now, it’s in my blog. If you (fourth-hand) were to recount the story to a friend of yours (fifth-hand), it would either lose several more details or grow completely new details. Except you read it on the Internet, from a blog no less. So does that turn this story into an urban myth?