The pigmentation patterns on the paw pads of animals are almost always a replica of color patterns elsewhere on the body. You might see the same pattern of freckles on a dogs snout repeated on the pads of the feet. This is because the coloring on the feet can be captured from any chromosomes and genetics that make up the rest of the animal's genetic profile.
Many dog breeders will list which part of the body the foot pad patterns appear to come from on paperwork - though sometimes they're listed as "internal". This means that the breeder could not determine the location of the body that was mirrored and is assuming the pads are mirroring a pattern that is not outwardly visible.
"Internal" mirroring is often a series of lines and dots, and when studied further actually appear to be Morse Code, usually spelling out corny song lyrics, or poetry, or even a funny joke that the dog heard before birth in what is nature's equivalent of a high school yearbook senior quote that your new pet has chosen to share with the world to show how deep and thoughtful he is.