In the final book of the "Anne of Green Gables" series, Rilla of Ingleside, Rilla's older brother Jem comes home from World War 1. With him comes his dog, who waited for him at the train station for four years.
I know it's fiction... don't know if that ever actually happened or not... but it's a good story.
Little "Dog Monday" has to follow Jem everywhere, of course, once he has his soldier back safe and sound. Monday even insisted upon going to church, where he jumped up in the middle of the sermon and barked joyfully. Afterwards, the Reverend John Meredith--who has some great lines in those books--patted Jem's dog on the head and said something I've loved:
"Faith and affection and loyalty are precious things wherever they are found. That little dog's love is a treasure, Jem."
I've always been a big-dog person myself; Dad's had a couple of Newfoundlands in the past. Oddly enough, though, the best animal friend I've ever had--and I've had horses, rabbits, goats, sheep, dogs, cats, and a bird in my lifetime--is my sister's happy-go-lucky toy poodle, Peaches. She plays and makes racket with Beth, and then when she gets tired she comes and sleeps in the crook of my arm. She's forever a puppy despite her eleven years, and I could swear she has a soul--love looks out of her eyes.