Albert Payson Terhune 
Lad: A Dog [EPUB ebook] 

Lady was as much a part of Lad’s everyday happiness as the sunshine itself. She seemed to him quite as perfect, and as gloriously indispensable. He could no more have imagined a Ladyless life than a sunless life. It had never occurred to him to suspect that Lady could be any less devoted than he-until Knave came to The Place.
Lad was an eighty-pound collie, thoroughbred in spirit as well as in blood. He had the benign dignity that was a heritage from endless generations of high-strain ancestors. He had, too, the gay courage of a d’Artagnan, and an uncanny wisdom. Also-who could doubt it, after a look into his mournful brown eyes-he had a Soul.
His shaggy coat, set off by the snowy ruff and chest, was like orange-flecked mahogany. His absurdly tiny forepaws-in which he took inordinate pride-were silver white.