4. Seymour (Futurama)
Granted Frys old dog Seymour was only really featured in one episode, but boy was it a belter. Originally a street dog, Fry befriended Seymour and adopted him, forming a strong bond in which they shared pizza and sang Walking On Sunshine (Im not kidding). As we all know, Fry was cryogenically frozen for 1,000 years, thus Seymour never saw his master again. Of course, we didnt know any of this until the episode Jurassic Bark in Futuramas fourth season. In one of the saddest moments in television, it was revealed that Seymour had waited for Fry ever since he was frozen, a whole twelve years until his death. As Seymour prepares to lie down for one final sleep, Connie Francis I Will Wait For You plays out his final breaths... and there wasnt a dry eye in the house. Personally, it took me a while before I could watch Jurassic Bark again. It was that traumatising. Seymour was an innocent dog and though he wasnt harshly mistreated as such, he spent more than half of his life waiting for Fry until his eventual death.