I thought the dumb dog in the greasers gave the show a lot of comic relief, especially in the episode where dog got amnesia and briefly became him. But the question was likable so I would have to say no. I would say i do not like many characters in the show. Even Cat was setup not to be likable. Don't get me started on Winslow.
No one really seems to be likable. The only reason why shriek can be liked is because she has a crush on Dog, and one time she even quit being a greaser to ice skate. Really, i don't see any reason why any other characters besides the above would be likable.