Jim "Dear" and "Darling" have had Lady, their pedigree cocker spaniel, since she was a puppy. Using her charms on them, Lady has been a pampered part of their upper class life, which all three consider perfect and complete. Lady's life takes a bit of a turn with the imminent addition of a baby into the household. Lady doesn't really know what a baby is or means, but gets a lesson in such from her two neighborhood friends, Jock, a proper Scottish terrier, and Trusty, a hound who doesn't realize that he may have lost his sense of smell. The baby's arrival indirectly has an effect on Lady's perfect life, most specifically when Aunt Sarah, with her two mischievous Siamese cats, comes to babysit. To escape this negative turn in her life, Lady eventually turns to Tramp, a mongrel she once met. Tramp lives a carefree life on the "wrong side of the tracks", and is renowned within his circle as being one of the most resourceful dogs, who is able to escape capture from the dog catcher as being unlicensed. He is also known as a womanizer. As Lady and Tramp fall for each other, the question becomes whether their two divergent lifestyles can mesh together, and if so what form that will take.