[ Hinkle / Blackjack ]
Blackjack, a work of fiction for young adult readers, was first published in 1946.
Thomas Clark Hinkle (1876 - 1949) was an American medical doctor and novelist, primarily of animal stories (often set in the American West) written for younger readers. More info here (Wikipedia). This book appears to be out of print, though used copies are to be found on Amazon and various online used book sellers.
Blurb:
"Blackjack's mother was a huge black dog, probably part Newfoundland, and so Jack was also a huge dog. Clark Preston claimed Jack as his own and the pair did a lot of hunting together. Wild dogs were a menace to the cattlemen in the area and Blackjack proved that he could stand up to any of them on the day of reckoning."
