This work lists no author(s) or illustrator(s); it was published in 1813 (London: J. Bumpus) and apparently never reprinted or republished.
This work appears to be a verbatim reprinting, without attribution, of the text of J. Macloc's New, Complete, and Universal Natural History, which was also published in 1813. Unlike Macloc's book, however, this one included illustrations for most of the dog breeds it discusses, although there is no Newfoundland image.
Since this work reprints Macloc's entry verbatim, the text is not reproduced here. Click the link above for the description of the Newfoundland.