John Guille Millais (1865 - 1931) was an English naturalist, painter and travel writer; his father was the famed Pre-Raphaelite painter Sir John Everett Millais. The younger Millais was particularly known for his bird paintings.
This particular book, an account of extensive travels, particularly hunting trips, in Newfoundland, makes only a single reference to Newfoundland dogs:
The best dogs are of the "Labrador" type. In winter they are used for hauling logs — one dog will haul 2 or 3 cwt. Seldom more than two are used together. The pure Newfoundland dogs are curly, and are a little higher on the leg than are the Labradors. (145)