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"It's not weird!"
— Karl's catchphrase.

Karl Leslie Fink is a recurring character in Dog With a Blog. He is Avery's former nemesis, as they compete as the two smartest kids in school. At "Little Smarty Science Camp", Avery stole his graham crackers, which Karl hates her for. He often has tea with Ellen and he sends her flowers very often under the name "Walter Perkins". He and Avery are enemies and is considered a jerk by Avery and Stan. He is also nosy, as he was obsessed with trying to figure out Stan's secret after he heard Avery and Chloe talking about him. Eventually, he does discover it but has vowed not to tell anyone (including his mother) after Avery sent his mother a text about the actions he was doing spying on Stan and nearly getting them both in trouble.


Karl made his debut in The Bone Identity, where he is introduced as Avery's nemesis. He was extremely nosy and was determined to figure out what Stan's secret was. He is really good at math, as he entered the X-Square Games against Tyler. He was disqualified for poor sportsmanship, by trying to bust Tyler for cheating.

Karl later returns in Dog Loses Girl, wanting to go to the Waterpark with the family. The family is missing Chloe, and he happens to find her so he brings her back. Ellen then says he can tag along.

In Crimes of the Art, Karl is frustrated when his entry to the art competition is not chosen as the winner and has a huge meltdown in front of everyone.

In Avery's Wild Party, Karl brings his sleeping bag to Ellen for her camping trip. After throwing their party, Tyler and Avery lie to her that they were throwing a party for Karl, so they convince him to act like it is his birthday.

In Don't Karl Us, We'll Karl You, Karl went under the alias of Walter Perkins, sending flowers to his neighbor Ellen. But Stan, Tyler, Avery, and Chloe come up with a plan to thwart his ways of visiting their house for good, and to stop his snooping presence towards Avery and Tyler especially.

In Avery-body Dance Now, Karl reluctantly teaches Avery how to dance so she doesn't fool herself in front of her date Wes Manning.

In Karl Finds Out Stan's Secret, it turns out that Karl has been spying on the family this whole time and reveals that he had found out Stan's secret in Stan Talks to Gran. Afraid that Karl might reveal Stan's secret, the kids send a message to his mother asking to delete all of the recordings he had made of Stan on his computer, but to everyone's surprise he was spying on them again and reveals to them that he was never going to reveal Stan's secret after he saw how much the kids care about him. Karl and the kids are able to get his mother's phone and delete the message before she reads it and then later reveal to Stan (who had been away at the Doggy Day Spa) that Karl knows his secret but promises that he won't tell anyone.


Karl is rude and nosy to Tyler and Avery. He is very nice to Ellen, who is nice to him in return, while he is also nice to Bennett, although he seems to dislike Karl. He has an on/off relationship with Chloe.

He is creepy and loves spying on others, learning their secrets, and is known for being just plain weird, as he has stolen Tyler's underwear in attempts to discover what makes girls so attracted to him.

Although, he is only like this because he is a sad, lonely person.


Karl is tall and has brown hair, which he spikes up in the front. He's also very slim.


Ellen Jennings

Although she is years nearly four times his age, Karl spends a lot of time with Ellen so he can spy on Tyler and Avery. They often have tea together, which they both say "it's not weird!" when it comes up in conversation. Ellen appreciates when Karl calls her beautiful when Bennett does not.

Avery Jennings

Karl has had a grudge on Avery since they went to science camp together, and she stole his graham crackers. The two are constantly at each other's throats, and Karl is always spying on her and Tyler. He and Avery become friends in Stan's New BFF.

Tyler James

Tyler despises Karl just as much as Avery. In The Bone Identity, Karl sees Stan giving Tyler hand signals in the math competition and tries to tell the judge he is cheating. However, Tyler wins and Karl leaves disgraced.

Chloe James

Not much is known between these two but Karl technically shares a love/hate relationship with Chloe. In Dog Loses Girl, Karl found Chloe and returned her home safely to Ellen, with Chloe not seeming to care about his dark side. In Crimes of the Art, Chloe entered Stan in the art gallery by simply covering his whole fur (save the head) in paint. Karl is outraged when the judge picks Chloe's piece instead of his and he tells his father in shame not to look at the winning art piece. In Don't Karl Us, We'll Karl You, Chloe pretended to be Walter Perkins at Karl's expense, knowing he was Walter Perkins, infuriating him. However, it was all part of a devised plan by Avery and Tyler to remove him from visiting the family home forever. But eventually he does return and Karl gets even with Avery and Tyler. Surprisingly Chloe also joins him in his payback scheme by making them wear hats covered in moldy melted cheese, which Karl and Chloe's hats did not have.


Lindsay despises Karl. Their hatred of each other is so far only revealed in The Bone Identity.


Max and Karl went to a school dance with Avery and Lindsay and danced with each other in Avery-body Dance Now. It is unknown what happened after. It's later revealed in Guess Who's Dating Karl, that Karl and Max are secretly dating.


Heather, unlike the other some teenage girls such as Lindsay, and Avery (formerly), has a crush on Karl which is especially shown in Stan Has Puppies. And is possibly dating him in Guess Who's Dating Karl (or it could be Max or Avery because in Avery-body Dance Now it is seen Karl and Max went to the school dance together or in Avery Dreams of Kissing Karl.


Season 1

 Season 2

Season 3


  • He sends Ellen flowers under the name Walter Perkins.
  • His dad is up in a space station and his mom is a bodybuilder.
  • He lost to Avery in a spelling bee with the word xanthosis.
  • He tends to leave his underwear on the bathroom floor.
  • He is an only child.
  • He often drinks tea with Ellen
  • His name Karl and Walter Perkins last name combined is Karl Perkins. Carl Perkins is the name of a musician.
  • He doesn't spend much time with his parents.
  • He often says weird things only to say, "It's not weird!" right after.
  • He and Max said: It's not weird in Avery-body Dance Now.
  • He at first tries revealing Stan's secret in The Bone Identity. Then he discovers Stan's secret in Stan Talks to Gran, but reveals that he is aware in Karl Finds Out Stan's Secret.
  • He starts dating Max in the episode Guess Who's Dating Karl.


  • "You know, you spit a little when you talk."
  • "That dog is a math genius!"
  • "What do you Fink?"
  • "It's not weird!"
  • "Avery and I are more than neighbors"
  • "Maybe Karl Fink belongs in a shed by himself. Maybe Karl Fink is destined for a life as a loner. Maybe Karl Fink referring to himself as Karl Fink is a large part of the reason why."
  • "I'm Walter Perkins and I have always been."
  • "I know your secret"
  • "I know your dog Stan, can talk."


To view the Karl Fink gallery, click here.