In 1961 Walt Disney adapted Dodie Smith's 1956 children's novel, The One Hundred and One Dalmatians into an animated feature film, 101 Dalmatians.
In 1967 Smith wrote a sequel to her novel titled, The Starlight Barking, which has a somewhat radical departure from the first novel by having a science-fiction-like mystery behind the plot.
The wikipedia page states that,
Disney archivist Dave Smith said that he was unaware of any considerations for adapting the novel although Walt Disney was interested in doing another project based on Smith's further writings.
This seems a bit contradictory, since most likely Walt Disney (or other execs at the company, as Walt passed in 1966) would have known of and followed her other works, if he was interested, despite that the archivist couldn't find specific evidence.
So I was wondering if there is evidence anywhere else that shows or suggests Disney (the person or the company) ever thought about optioning this second novel for an animated sequel?