system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why dogs are so finicky about where they poo?

My dog didn't shit for three days because every time he found a spot he'd curl up, realize it wasn't good enough, and cancel the poo.  

My tiny brain cannot compute the evolutionary need for this.
gpt
Poop has a very distinct smell depending on the diet and predators can smell it from a long ways away. He couldn't find a spot that would be safe, and therefore he did not poop. It's why dogs eat the poop that their pups make.