An excellent episode of Tom and Jerry, Dog Trouble sees the famous arch-enemies team up to fight a common foe: Spike, a snarling, toothy bulldog whose sole purpose in life seems to be to chase anything that moves and try to eat it.
After a little 'cat and mouse' action (natch) from the world's greatest cat and mouse, this episode really gets going when Spike joins in on the fun, after being disturbed whilst napping (a common theme in later T&J cartoons). Tom and Jerry become trapped by the dog and, on realising that they are both in the same predicament, put aside their differences to plan their escape.
This one is pure class, and anyone who doesn't find the sight of Spike leaping through the air to try and snap at Tom's tail extremely funny needs to get their sense of humour an overhaul. Top animation, a great soundtrack, and wonderful characterisation all go to make this an better-than-average episode.