Dick And Dora was a series of primary school reading books, very much like the Janet And John, Peter And Jane or Topsy And Tim series, from the the mid-1960s, but they can still be found dog-eared and slightly dusty on the shelves of many modern-day school libraries. They had unique illustrations, I remember, making use of stylistic shading.
Nip the dog and Fluff the cat were largely featured in the Dick And Dora books, and remember all of them running together a lot of the time. And because they ran alot (like children used to), they got to see a lot of the world and have great adventures together. The Dick And Dora series was so simple compared to today's books, but they really got your imagination going.