101 Dalmatians is one of Disney's most impressive accomplishments. Except for a minor complaint about not having enough songs, this movie has received almost universal praise, ranking in the top 5 Disney movies of all time, according to Rotten Tomatoes. The (mostly animal) characters display strength and charm rarely seen even in the kindest humans.
While some of them are brave, others display clear signs of intellect, perseverance, or loyalty. Considering that the four Hogwarts houses classify their students according to their inner traits, one might wonder how the heroes in 101 Dalmatians (and the villains who want to hurt them) would have been assessed by the Sorting Hat, if they had ever, somehow, gone to Hogwarts.
Cruella De Vil - Slytherin
Part of Cruella's nature is her voice (simultaneously silky and grating) much like Voldemort's split personality. She is the definition of a Slytherin: her cunning attempts to buy the Dalmatians from the Radcliffe's are openly rebuffed by Roger, but her old friend Anita is slightly amenable to her charms.
Cruella actions are purely self-serving, as many Slytherins are known to do. Given her desire to stay ahead of the latest trends outcompetes any humanity she might have had at one point in the cold, dry hollow where her heart is meant to be.
Lucky - Gryffindor
Lucky does not exactly espouse the ideals of boldness and honor that are expected from a Gryffindor. However, there is no better symbol that represents him than the Lion because he is brave even when he is terrified. For instance, he leads the charge against Horace and Jasper when the puppies are trying to escape their captors.
Most importantly, Lucky happens to be proud and self-reliant, ideal traits of a member Gryffindor, except when his pride leads him to become complacent. This is evident when he is more interested in watching his TV show in the villain's lair than thinking about their intended fate.
Patch - Ravenclaw
Patch is very similar to his brother Lucky (resulting in some adorable fraternal rivalry, mostly over their favorite television program, Dirty Dawson.) He is as smart as a whip, classifying him as a Ravenclaw, but he also displays immense amounts of sheer nerve.
When Horace and Jasper tried to attack the pups, Patch was among the few of them who actually tried to defend his siblings from those monsters.
Nanny - Hufflepuff
The Radcliffe housekeeper, Nanny, is beloved by the family, and especially by the dogs. In the 1996 live-action adaptation, it is revealed that she used to be Anita's nanny when the latter was a child, meaning she has been around for a long time. As a Hufflepuff, Nanny does not enjoy conflict, but her loyalty and love for the pups insisted that she fight off the kidnappers.
She is a modest person, preferring not to stay in the limelight, which explains why she disappears for most of the second and third arcs. Nanny's moral code allows her to take the Radcliffes' side against Cruella when she came over to purchase the puppies.
Pongo - Ravenclaw
In typical Ravenclaw fashion, Pongo concocts a devious plan to ensure his master, Roger, does not have to spend his life alone. While taking a walk in the park, he spies Anita sitting on a bench. Although his first attempt at introducing them is a failure, he manages to get the humans all wrapped up in his leash until they lose their balance and fall into the pond.
Most Ravenclaws are known to be responsible people, to themselves as well as others. This is shown in the way Pongo takes care of his new children, sharing parenting duties equally with Perdita.
Roger - Hufflepuff
The best characteristic of a Hufflepuff is their commitment to their ions. Roger's life revolves entirely around composing his songs, or, as Pongo describes it, "he's married to his work."
He is a gentle soul at heart, as seen when he gently rubs a newborn puppy clean with a towel while waiting for his wife and Nanny to help Perdita deliver the remaining litter. Roger is devoted to his family, including every single one of their 86 newly obtained Dalmatians, convincing Anita that they should take care of all of them.
Perdita - Gryffindor
In most instances, Perdita is a shining example of propriety, ensuring that all her little ones (and, occasionally, Pongo) follow a strict set of rules regarding meals, naps and walks. Nevertheless, her Gryffindor nature comes to the forefront when her babies are in danger.
In one scene, she shatters a windowpane in order to reach her puppies, baring her teeth viciously at Horace and Jasper for daring to raise a weapon against them. Perdita has an uncanny ability to perceive imminent threats, like when she suspected Cruella was going to find a way to harm her children.
Anita - Hufflepuff
Anita is the quiet type; her first appearance is during the park scene, in which she is peacefully reading a book while Perdita sits next to her. Being a Hufflepuff, she is incredibly patient, especially when her husband, Roger, goes into one of his theatrical rants.
Anita maintains her poise and composure even when Cruella mocks her husband and her lifestyle, claiming that they won't be able to take care of the puppies. In response, Anita merely responds with a timid, "We'll get along."
Seargent Tibbs - Gryffindor
Tibbs is the exact opposite of the unfair stereotype associated with cats. He is remarkably courageous, taking charge of the puppies' escape plan. It is Tibbs who first discovers what Cruella plans to do with her captives, and his Gryffindor personality shines bright when he sees his dependents in grave danger.
Even though the kidnappers corner him and the little Dalmatians, he stays in front of them, albeit extremely scared. In fact, when Jasper raises a fire-poker, intending to strike the dogs, Tibbs refuses to budge from his spot, at least until Pongo and Perdita enter the fray.
Jasper & Horace - Slytherin
Jasper & Horace are bumbling idiots who can barely tell time, but Cruella's viciousness has chased away all the other potential goons she could hire.
They are both classic Slytherins in their underhandedness and cruelty, but their inherent stupidity recalls Crabbe and Goyle, Draco's gormless yes-men. However, these two manage to finally stand up to Cruella after the car crash climax, saying, "Ah, shut up!" in response to her incessant wailing.