Pretty self explanatory..
A twist on Dog fuck dog...
For those who still don't get it... Dog sex.
Sarah: Damn Jill, thats ugly dog eat dog right there
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Can be used interchangeably depending on the context
Contexts could include getting really drunk or doing a task to the best of your abilities
Adam: Hey Felix, you ready to “Get the dog on the dog”?

Felix: Yeah let’s get blinded
by Buggsy Malone December 5, 2021
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The Fictional Team of Dog River in the Episode "Face Off" of Corner Gas
The Dog River River Dogs Almost Win!


- Front Page of The Howler(Corner Gas Newspaper)
by Seagulls Of Santa!!! August 14, 2008
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Dogs dont eat dogs, they eat dogfood or leftovers. A wolf might eat a dog if it hasn't had a decent meal in a while.
A dog eat dog world is not a reality, humans came up with that to compare themselves to their dogs.
by The Original Agahnim June 3, 2021
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"Dog eat dog" is analogous to the idiom "every man for himself", which implies a situation in which fierce deadly competition is necessary for your survival.

Some of these recent definitions seem to be offended at this saying due to their ignorance of the origin behind this 500 year old idiom. Some people do not seem to realize that this idiom is NOT meant to be taken literally. So, why is it called "dog eat dog" you may eagerly ask? Well, the idiom is actually a play on the much older latin idiom "dog does NOT eat dog" (canis caninam non est), which originated as early as 43 BC and first spoken by Roman scholar Marcus Tarentius Varro.

"Dog does not eat dog" is a proverbial saying indicating that even animals are better than humans in that they don’t prey on their own kind. The phrase entered into English discourse in 1543. Eventually, the phrase got flipped and applied to humans and henceforth "dog eat dog" was born. Both idioms generally imply the same thing (that humans are capable of being merciless).

So to summarize, the idiom "dog-eat-dog" is derived from its parent idiom "dog-does-not-eat-dog". The latter idiom makes sense in and of itself, while the former idiom ONLY makes sense in relation to its latter.

Case closed and dismissed.
Me: It's a dog eat dog world out there.
Some kid: No it's not. It never was a dog eat dog world. Humans eat humans, but dogs don't eat dogs.
Me: My guy, you are so heavily misinformed. Dog eat dog isn't referring to dogs, it's referring to humans.
Some kid: So why don't they just name it "human eat human" instead?
Me: Because context my guy, it's all about context. You see... "dog eat dog" actually belongs to the much older idiom "dog does not eat dog", indicating that dogs never prey on their own kind. It took around 700 years for this idiom to become flipped and applied to humans. And if it weren't applied to humans, well, that would completely negate the original meaning as that would imply dogs are merciless in which they aren't (most animals will back down from a fight if they lose, humans don't).
Some kid: No reply.
Me: Also since you took it literally, I'll have you know that from an evolutionary standpoint, dogs will eat other dogs if this is what ensures their survival.
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A way of censoring yourself from saying "dog shit"
Your dog dog at this game!
by FattyBoomba67 April 27, 2021
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