[ Waldo / With Grenfell on the Labrador ]
Fullerton Waldo (1877 - 1933) was an English writer, primarily of travel narratives.
This work, first published in 1920, is a biography of Sir Wilfred Thomason Grenfell (1865 - 1940), an English physician who devoted his career to providing medical and social services to the inhabitants of Newfoundland and Labrador; he was knighted for that work.
The only specific mention of Newfoundland dogs occurs about halfway through the book:
It is too bad that for the sake of the sheep the noble Newfoundland dog that chased them has had to perish. It is almost impossible today to find a pure-breed example of the dog that spread the name of the island to the ends of the earth.
For another biography of Grenfell that also mentions Newfoundland dogs, see The Story of Grenfell of the Labrador here at The Cultured Newf.
For other works that comment on the declining prevalence of Newfoundlands both in Newfoundland and in the dog world in general, see "The Disappearing Newf" here at The Cultured Newf.