Mr. Duncan kept returning. Already renowned for his work as a war photographer in Korea, he enjoyed privileged access to La Californie, taking thousands of photographs of Picasso and Ms. Roque as well as of Claude and Paloma, Picasso’s children with his former mistress Françoise Gilot. And Lump was frequently in the pictures.

Now 90 and still living in the South of France, Mr. Duncan has so far published 25 books of photographs, including eight of Picasso at work and play.

He has also long defended Picasso against criticism of his personal life and this continues in his new book: by showing the artist in the intimacy of his home, Mr. Duncan seeks to portray him as an affectionate family man with a sentimental attachment to a funny little dog.

Certainly, even though a large boxer called Yan and a goat called Esmeralda already lived in La Californie, Lump enjoyed the run of the house. In Mr. Duncan’s photographs, the dachshund is seen around the dining table at mealtimes, and in one shot he even stands on Picasso’s lap to eat off the artist’s plate. In another, Picasso cradles Lump in his arms as he might a baby.

Image Lump the dachshund, in the South of France in 1957, with Picasso and a presumably undervalued gift: a Picasso rabbit, suitable for chewing. Credit... David Douglas Duncan/From “Picasso and Lump: A Dachshund’s Odyssey” (Bulfinch Press)

Picasso liked to work alone, albeit allowing Mr. Duncan to be present. But Lump is often also on hand, occasionally demanding attention by bringing in a stone and insisting that Picasso kick it away to be chased. One series of images shows Picasso buying some respite by making a cardboard rabbit; Lump immediately seized it and carried it into the garden to chew on. (How much would that Picasso be worth today?)