Black Dogs: Further Sources to Check (sources)
FATE June 1990
Black Dogs are in Goethe's Faust.
Other names: Shuck, Black Shuck, Old Shuck, Skeff, Moddey Dhoo, Trash, Skriker, Padfoot, Hooter, and Gwyllgi.
Theo Brown, british, published paper including 39 accounts between 1829 to 1958.
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Spectre-Dogs:
To have the "black dog on the back" has become a general phrase, though perhaps few who use it have an idea of its origin. The following anecdotes about spectre-dogs will illustrate this phrase, and show how generally this branch of superstition is received.
1 Chambers's Book of Days, vol. ii. p. 433.
2 Notes and Queries.
3 Notes and Queries, vol. ii. p. 515.
4 ibid., vol. i. p. 295.
5 Notes, and Queries.
https://books.google.com/books?id=CPADAAAAYAAJ&pg=PA259&dq=%22In+the+beg...
http://www.simonsherwood.co.uk/blackdog.htm#Accounts
http://www.hiddenea.com/shuckland/introduction.htm
http://www.sjgames.com/gurps/Roleplayer/Roleplayer30/GhostDogs.html