It depends. The true definition, with is roughly law without force, then it wouldn't be too bad. Sounds like it would just be a non corrupt world. However, modern day groups like ANTIFA, it would suck. Things have been blown out of proportion honestly to the point where anarchy, or "anti-fascism", almost looks like fascism.
Answer:
'Dog eat dog' is an innane phrase generally used by inarticulate people. The certain individual who coined the phrase was most likely unaware of or simply ignorant of the unwavering fraternity held between members of the species canis familiars.
Explanation:
It's a dog-eat-dog world and variants, in fact, echo an earlier proverb that comes all the way from Latin.