Would you like a real, full cry today? Three steps:

1) Pick out a memory of your childhood dog and hold it in your mind for 10 seconds. 

2) Read this Wikipedia entry describing dogs that were faithful after their masters’ deaths

3) Watch this clip from Futurama. It’s the last scene in an episode where the Professor tells Fry they have enough DNA to bring back his dog Seymour. Fry considers it, but decides not to, reasoning that his dog Seymour had lived for another 12 years  after Fry disappeared and probably had a new family and forgot all about him anyway. Then there’s this flashback.