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Voiced by: Jim Cummings
- Abhorrent Admirer: Occasionally portrayed as this towards Shriek.
- Butt Monkey
- Catchphrase: "Bee-yoo-tee-ful!"
- "It just doesn't get any better than this!"
- "Terr-riffic" (sarcastically)
- "MY BODY MY BODY MY BODYYYYAAAGH!!!"
- A deep-voiced "Ohhh MOMMA" when he's feeling greedy.
- Cats Are Mean: Sometimes.
- Cats Are Snarkers: And how! He gets it from his dad.
- The Chew Toy: Poor guy can't seem to catch a break.
- A Cat Named Cat
- Happily Adopted
- Jerk with a Heart of Gold
- Like Father, Like Son
- Mr. Vice Guy: He can be greedy, and cross the line into villainy, but most of the time he is the hero.
- Neat Freak
- No Respect Guy
- Small Name, Big Ego
- Surrounded by Idiots: He's even attached to one!
- This Loser Is You
- Trademark Favorite Food: White fish chub. And fish in general.
- Why Did It Have To Be Water?
Voiced by: Tom Kenny
- Adorkable: Has shades of it.
- So does his mother.
- Beware the Nice Ones: Cat once learned the hard way not to actually make Dog angry.
- Big Eater
- Catchphrase: Hi-ho diggedy!!
- Dog even calls it his catchphrase!
- He gets it from his mom.
- Cloud Cuckoolander
- A Dog Named Dog: Literally.
- The Ditz
- Dogs Are Dumb
- Dumb Is Good
- The Fool
- Happily Adopted
- Idiot Houdini: Dog is a hyperactive dimwit that causes chaos with his canine tendancies, it is usually Cat that suffers the consequences for it however.
- Jerkass Ball: Sometimes.
- Lethally Stupid
- Like Mother Like Son
- Man Child/Psychopathic Manchild: Depending on the Writer.
- The Millstone
- Ping-Pong Na´vetÚ
- Too Dumb to Live
- Trademark Favorite Food: Bones, moldy meat and garbage.
Voiced by: Carlos Alazraqui
- Bratty Half-Pint
- Catch Phrase: "What are you, nuts!?"
- Deadpan Snarker
- Even Evil Has Standards: Not quite evil, but in "Dog Power" he's genuinely appalled at Cat's treatment of Dog.
- Evil Laugh: His signiature cackle.
- Informed Species: He's allegedly a mouse, but looks more like a Smurf.
- Jerkass: The majority of the time, mostly to Cat.
- The Napoleon
- Sitcom Arch-Nemesis: To Cat.
- Small Annoying Creature: Invoked. He considers himself a "harasser".
Mervis and Dunglap
Voiced by: John Kassir
- Messy Pig: Mervis, for a given definition of "messy".
- Only Sane Man: They are the only normal characters in the series.
- Those Two Guys: They don't seem to serve any other purpose than this.
- Vitriolic Best Buds: Often seen bickering and yet are always together.
- Wicked Weasel: Averted with Dunglap.
- Bystander Syndrome: He'd probably be the Only Sane Man if he didn't succumb to this all the time.
- Cartoon Creature: Nobody's quite sure what he is.
- Word of God says he was originally supposed to be a monkey.
- Deadpan Snarker: Sometimes.
- The Eeyore: Subverted; he isn't so much depressed as he is boring and deadpan.
- Ironic Name: He's anything but sunny.
- Lazy Bum
- The Load
- Perpetual Frowner
- The Stoic
Voiced by: Nika Futterman
- Action Girl: She gained her love of zoology after helping her family wrangle cattle. Not to mention the fact that she can go toe to toe with the Greasers.
- Artistic License - Ornithology: She looks and acts nothing like the type of bird she's supposed to be.
- Catch Phrase: "Unbelievable!"
- For Science!: Most everything she does. Justified because she's a zoologist.
- Genki Girl
- Informed Species: She's apparently a whip-poor-will. Specifically, she says that she's a "yellow-bellied whip-poor-will", a species that doesn't even exist in real life.
- The Lad-ette
- Nice Hat
- Only Sane Woman: To some degree.
- Small Annoying Creature: Over-the-top, loud, repetitive, especially with catch phrase
- Not So Above It All: But she's always willing to join in with CatDog's shenanigans.
- Phrase Catcher: "Hola Lola", usually said by Cat.
- Punny Name
- Ship Tease: Occasionally seems to flirt with CatDog, although that was mostly in her first appearance.
- Slapstick Knows No Gender: She's not immune to the Amusing Injuries everyone else on the show gets.
- The Smart Guy
- Spicy Latina
- The Thing That Would Not Leave: In her first appearance.
- Ambiguously Gay: Overall the mannerisms of this celeb and posh stylish character show hints of being gay and at times he seems to have a thing for Dog, especially in episodes CatDog's End, Dog the Not so Mighty, and Dog Ate It.
- Catch Phrase: "And I LOVE it!"
- Upper-Class Twit: Granted he's a relatively amicable one.
The Ingrid Twins
Voiced by: Laraine Newman
- Always Identical Twins: They look alike and even have the same name.
- Opposites Attract: In one episode, it's shown that the Genki Girl Ingrid likes Deadpan Snarker Cat and the Deadpan Snarker Ingrid likes Genki Guy Dog.
- Sexy Scandinavian: Both are beautiful blondes and presumably Swedish, sharing a stereotypical Scandinavian name.
- Ship Tease: They often appear on dates with CatDog.
- Sibling Yin-Yang: One of them is a Genki Girl and the other is a Deadpan Snarker, hence why they're pretty much perfect for our conjoined duo.
- Throw The CatDog A Bone and Fish/Yank The CatDog's Chain: Depending on the occasion, they can end up doing one, the other or both.
- Bolivian Army Ending: They're last seen getting eaten by a giant sea monster. The reason it's this and not a certain other trope is because Cat, Dog and their parents all survived the same fate, so it's possible that the Greasers would get out too (not that it really matters).
- Bratty Half-Pint: Shriek
- Embarrassing First Name: Cliff's name is short for Clifford, which he isn't proud of. Shortly after, it's revealed that Lube's name is Ignatius.
- Fantastic Racism: They really hate cats. Crosses over with Animal Jingoism because they're dogs.
- Fat Bastard: Cliff
- Gang of Bullies
- Hidden Depths: All three of them have these. Cliff is very much in touch with his feminine side, Shriek has a crush on Dog and is Secretly Wealthy and Lube is a skilled mechanic.
- Meaningful Name: Shriek. She shrieks. Boy does she shriek
- Like Parents Like Son: Lube's parents are shown in the finale, and they're just as dumb as he is.
- Quirky Mini Boss Squad: When Rancid is the Big Bad, they're usually acting as his minions.
- Real Men Wear Pink: Cliff takes ballet. He's not only really good at it, but he's also really proud of it.
- Secretly Wealthy: Shriek. She really hates it, though.
- Slapstick Knows No Gender: Whenever Lube and Cliff get injured amusingly, Shriek isn't spared just because she's a girl.
- Spoiled Brat
- Terrible Trio
- Token Good Teammate: Lube is not only the nicest Greaser, he's probably the nicest character in the entire show.
- True Companions: Several episodes show them to be this. They may be rather nasty bullies, but they stick together.
- Villainous Crush: Shriek has a crush on Dog. Strangely enough, Cat seems to be attracted to her.
- A few episodes suggest that Dog reciprocates Shriek's crush. In one where they're all convinced that the apocalypse is coming, Shriek confesses to and kisses him, prompting Dog to go into Post-Kiss Catatonia with a big goofy grin on his face.
- You Are What You Hate: The Series Finale reveals that Lube is part-cat.
- Big Bad: Nearly every episode he's in has him as the main antagonist.
- Big Bad Wannabe: Deteriorates into this as the show went on.
- Catch Phrase: "Leaping lumbago!" and "What what WHAT!?"
- Corrupt Corporate Executive: It's implied that he actually owns Nearburg.
- The Ditz: Sometimes.
- Even Evil Has Standards/Pet the CatDog: Seeing CatDog swarmed with psychotic fleas and the flea belt no longer being enough to help them is enough to convince him to give them a flea bath with no apparent ulterior motive.
- Fat Bastard
- New Job as the Plot Demands: He has all the jobs. What job he is doing depends on the episode.
Eddie the Squirrel
Voiced by: Dwight Schultz
- Bratty Half-Pint
- Harmless Villain
- Not So Harmless: He almost killed Lube with a tick at one point and built a giant robotic cat to get revenge on the Greasers and enslave the town.
- Ineffectual Sympathetic Villain: Heavy on the ineffectual, light on the sympathetic.
- Informed Species: He's supposed to be a squirrel?
- Motor Mouth: Nobody can shut the little twerp up.
- Small Annoying Creature
Voiced by: Maria Bamford
- Bitch in Sheep's Clothing: A gorgeous movie star who is also vain and snobbish.
- Blondes Are Evil: Well, maybe not evil, but definitely snobbish and mean.
- Cats Are Mean
- Celeb Crush: Cat has one on her.
- Jerkass: Noticing a pattern here?
- Nice Character, Mean Actor: Tends to play sweet love interests, but is a huge snob.
- No Celebrities Were Harmed: A spoof of Tallulah Bankhead.
- Pet the CatDog and then Yank the CatDog's Chain: She declares Cat her soulmate when he reveals that he has every quality she's looking for...right until Cat accidentally burns her dog.
- Rich Bitch: Very rich, very nasty.
- What Does He See in Her?: With all the hate and abuse she dishes out on Cat whenever he's around her, you'd think he would've given up on her by now.
- Arch-Enemy: To Dog.
- Big Bad: Of "Fistful of Mail".
- Formerly Fat: As the Paperboy, he was so chubby as to be unrecognizable as a slender, sleek adult. An interesting example, as its only relevance to the plot is to reveal just why Dog didn't recognize him at first.
- Gold Tooth: Which signals to Dog that he's the Paperboy all grown up.
- Nice Hat: In keeping with his "Cowboy" theme.
- No Name Given
- Schoolyard Bully All Grown Up: Used to be a paperboy who mocked Dog for being too slow to get the newspapers he threw.
- Slasher Smile: Wears one whenever he's not being a Smug Smiler.
- Smug Snake: An appropriately reptilian one too, though he's a lizard.
- Super Speed: His specialty. He's the first and last mailman to surpass Dog in speed.
- Unstoppable Mailman: The first mailman Dog couldn't stop. Until the end, that is.
- Villainous Breakdown: Has one after Dog defeats him.
- Bigfoot, Sasquatch and Yeti: The mom looks like this kind of creature. None of the other characters know what she is, not even her husband.
- Catch Phrase: Dog got his from the mom.
- Deadpan Snarker: The dad, which is where Cat gets it. Seeing his father make the same sarcastic remark he makes is what ultimately leads Cat to accept that these two are indeed his parents.
- Genki Girl: The mom, which is where Dog gets it. They bond almost instantly.
- Good Parents: They loved CatDog dearly, even though they weren't their biological parents. When they were separated, the two of them spent almost their whole lives searching for their sons.
- Happily Married
- Interspecies Adoption: They adopted CatDog when the two of them were babies.
- Interspecies Romance: The dad's a frog, the mom is a big blue Sasquatch looking thing.
- Like Father, Like Son: Dog takes after the mom, Cat takes after the dad.
- Mama Bear and Papa Wolf: To CatDog; they spent years searching for them after they were separated.
- Walking Spoiler: Knowing too much about them spoils the Series Finale.
- Wham Line: The mom has one when she finally speaks:CatDog's Mom: HI HO DIGGETY!