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slot dog 

Women yelling slot dog at you in a casino
slot dog by Slotdog May 13, 2023

split the dog 

Sorry boss cant work tomorrow it gonna be a split the dog kinda day
split the dog by Sonny bertram February 13, 2019

Split hot dog bun 

When a naked old bird touches her toes with her back to you and her fanny looks like a split hot dog bun. Usually accompanied by piles.
The female cast of Cocoon were bent down in the wet changing rooms at my local swimming pool and I got an eyeful of various split hot dog buns.
Split hot dog bun by jamnx May 3, 2011

Finer than a dog's hair split three ways 

Means that something is very fine, or that you feel excellent. If someone asks how you feel and you simply say "fine", you might just be saying it out of convention. Adding the "dog's hair split three ways" shows that you actually mean it.

Another form of the expression is "finer than a frog's hair split three ways", although literal frogs do not have hair.
You: How are you doing today?

Me: Why, I'm doing finer than a dog's hair split three ways!