“There is very little thanks in history. Dog eat dog.”
Rabbit at Rest (1990)
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John Updike 240
American novelist, poet, short story writer, art critic, an… 1932–2009Related quotes

“One's a dog-eat-dog world, and the other one's just the opposite.”
http://www.time.com/time/magazine/article/0,9171,995029,00.html
Running a Business vs. Running a City

From his Humanity show; quoted in "Ricky Gervais chooses vegan," Vegetarians of Washington (13 September 2017) https://vegofwa.org/tag/ricky-gervais/

“Do you know they're now producing eating dogs for the anorexics?”
Said to a blind, wheelchair-bound woman who was accompanied by her guide dog, as quoted in "Philip tells blind woman: 'They've got eating dogs for anorexics'" http://www.telegraph.co.uk/news/uknews/1393020/Philip-tells-blind-woman-Theyve-got-eating-dogs-for-anorexics.html in The Telegraph (3 May 2002)
2000s

Siccome al Cane in guardia posto all'orto,
Che non mangia i poponi, e non congente,
Che altri ne mangi, ogni uomo gli dà torto.
Act II, scene i
Timone (c. 1487)

“My little dog—a heartbeat at my feet.”
Variant: My little old dog
a heart-beat
at my feet

“I am a cub of a tiger; don't mistake me with a carcass eating dog.”
Translated by Arjun Bhadra Khanal https://500px.com/photo/29827237/amar-singh-thapa-badakaji-by-arjun-bhadra-khanal|
In the context of wealth offered by British General David Ochterlony during Anglo-Nepalese War.
Quote

“[When asked if he could think of a cure for a dog who eats soil]”
I'll sleep with her. I’m a special kind of vet - people bring the animals in, and I sleep with them. Do you have any sick animals that need some time with a vet? [...] What I was saying was that I was going to start a vet practice. People would bring me their sick animals and I’d sleep with them. Turtles. Parakeets. I’d give parakeets blow-jobs. I’d go around the zoo, like James Herriot... saying ‘Giraffes? Really? Bring them to me.’
HermAphroditeZine, Autumn 1999