101 Dalmatians

In 1950s London, aspiring songwriter Roger Radcliffe lives in a bachelor flat with his pet Dalmatian, Pongo. Deciding both of them need a "mate", Pongo watches women and their dogs in the street. Noticing a young woman named Anita and her Dalmatian Perdita, he drags Roger to a park to arrange a meeting. Despite a tumultuous first encounter, Roger and Anita fall in love, and soon marry, with Pongo and Perdita attending.
The Radcliffes hire a nanny and move into a small townhouse near Regent's Park. Perdita becomes pregnant with a litter of 15 puppies; shortly afterward, Anita's entitled, fur-obsessed former schoolmate Cruella de Vil visits the Radcliffes and expresses a keen interest in the puppies. Perdita confides to Pongo she is suspicious of Cruella's motives. When the puppies arrive, Cruella returns and offers to buy them for a large sum. Roger stands up to her and announces firmly that the pups are not for sale; enraged, Cruella swears revenge.
Several weeks later, Cruella makes good on her threat by secretly hiring Jasper and Horace Badun, two burglar brothers, to steal the puppies. The police are unable to find the puppies or prove Cruella was involved, so Pongo and Perdita utilize a nationwide canine gossip line, the "Twilight Bark", to solicit help from all the English dogs.
In Suffolk, Pongo and Perdita's message reaches The Colonel, an Old English Sheepdog on the farm of a retired cavalry officer. After the barn cat Sergeant Tibbs hears puppies barking at the nearby de Vil estate, he and The Colonel investigate. They find the Badun brothers guarding the fifteen stolen puppies, as well as 84 more dalmatians bought and paid for in shops. The Colonel sends word back to London, and Pongo and Perdita travel to Suffolk as fast as they can.
Learning that Cruella intends to make dogskin fur coats from her captives, Tibbs hastily tries to evacuate the puppies. The Baduns intervene, but Pongo and Perdita arrive and hold them off while Tibbs and the Colonel get the puppies to the farm. After hearing of Cruella's schemes, Pongo and Perdita decide to adopt the other 84 puppies to protect them.
The Dalmatians start their homeward trek, pursued by Cruella and the Baduns. They eventually make their way to Dinsford, where they meet a Black Labrador who offers them a ride in a moving van bound for London. Cruella and the Baduns arrive, so Pongo has his whole family roll in a sooty fireplace to disguise themselves as other Labradors. As they board the van, their cover is blown at the last minute, when melting snow washes off some of the soot. Furious at having been tricked, Cruella pursues the van in her car and tries to ram it off the road. The Baduns also attempt a similar maneuver, but their lorry collides with Cruella's car, and both vehicles crash into a ditch. Cruella berates the Baduns and sobs with fury as the van drives away.
In London, a miserable Nanny and the Radcliffes try to enjoy Christmas. It is revealed that they have acquired huge wealth from a song that Roger had written about Cruella, which has become a big radio hit; but they are missing their canine companions too much to enjoy this much. The Dalmatians suddenly flood the house, reuniting with their owners. Upon counting the massive family of dogs, Roger suggests they use his songwriting royalties to buy a big house in the country, so that they can keep all 101 Dalmatians.