In this one Sylvester is left at home when his owners leave for a California vacation. They completely forget to put him out and didn't leave food out for Sylvester before they go. Luckily for Sylvester, he finds a large collection of canned food. Unluckily for Sylvester, the only can opener is in the possession of a mouse who doesn't want to give it up. The rest of the cartoon consists of the mouse tormenting Sylvester as he tries to obtain the opener.
This cartoon is notably one of The 100 Greatest Looney Tunes.
- The Bad Guy Wins: The mouse succeeds in starving Sylvester, regardless of how doing so benefits him in anyway.
- Bowdlerization: On CBS, the part where Sylvester uses a metal coat hanger to get the can opener, only to have the mouse hook it onto a pair of wires that electrocutes Sylvester was edited to remove the scene of Sylvester getting electrocuted (which makes it painfully obvious that something is missing).
- Nickelodeon also cut the scene CBS edited, but the channel deleted the entire scene instead of leaving the entire scene in and cutting the punchline to the joke. Also cut on Nickelodeon is the scene of Sylvester using an axe to open his can of cat food, only for the blade to fly off and go through the mail slot. It should be noted that similar scenes in "Yankee Dood It" (the electric coat hanger scene) and "Moby Duck" (the flying axe blade) were not censored when aired on Nickelodeon.
- Comedic Sociopathy: See For the Evulz below.
- Determinator: Two way example. For all the threats and elaboration Sylvester takes, that mouse must really want him to starve.
- Disneyfication: "Moby Duck" is essentially the same cartoon retooled to make the mouse's character provoked and sympathetic. It kind of comes with the role being played by Speedy Gonzales after all.
- For the Evulz: This might be the meanest cartoon Warner Brothers ever made. Anyone who watches the Looney Tunes canon will observe tons and tons of Comedic Sociopathy. However, the victims of this are almost always people who somehow have it coming. Elmer and Yosemite Sam are trying to kill Bugs, while Wile E. Coyote, the Tasmanian Devil, and Sylvester are trying to eat their prey. "Canned Feud" is different in that at no time does Sylvester try and eat the mouse. All he wants to do is be able to eat while his master and mistress are away. The mouse, for his part, deliberately withholds the can opener from Slyvester. And if that weren't enough, the mouse tortures Sylvester, repeatedly dangling the can opener in front of him only to devise elaborate traps. The cartoon ends with Sylvester having finally obtained the can opener—only to find that the mouse has padlocked the cupboard. Sylvester is apparently doomed to starve to death.
- Harmless Electrocution: Luckily for Sylvester, as the mouse tricks him into making an electrical short that burns off all of his hair.
- Karma Houdini: The mouse avoids any backlash from Sylvester and when he finally gets the can opener, he improvises and padlocks the cupboard.
- Lighter and Softer: The remake "Moby Duck" has less dark slapstick and implications, and also adds a Laser-Guided Karma dynamic for the mouse. Here Speedy merely holds onto the can opener for negotiation purposes against the selfish Daffy, and even submits and hands it to him anyway in the end (only for Daffy to, much like Sylvester, lose the cans to a tide).
- No Can Opener: Sylvester is left in the house while his owners are away. There is plenty of canned tuna, but only one can opener, and the mouse has it. Hijinks ensue.
- Parental Neglect: The pet owner kind, as Sylvester's owners forget to put him outside and to leave any food out before leaving for California (leaving him locked inside to starve).
- Robinsonade: The premise of "Moby Duck".
- Unsympathetic Comedy Protagonist: The mouse, who would make Tweety and even Jerry look benevolent by comparison, mainly because we are not shown whatever Sylvester may have done to provoke the mouse, if he did anything at all.
- Villain Ball: Daffy in "Moby Duck". Compared to the vindictive rodent in "Canned Feud", all Speedy wants is to share the canned food fairly, but Daffy persists in "survival of the fittest" and torturing himself trying force the can opener from Speedy.
- The Voiceless: Sylvester talks a lot but the mouse never does.
- Yank The Cat's Chain: Poor Sylvester. The same occurs for Daffy in "Moby Duck", though it's much more a case of Laser-Guided Karma.