UPDATE: Found dog owner and returning “Purdy” to owners. Thank you for posting the information. 
Jesse. 

This dog was turned over to me today around 11am. A young couple traveling through area stated dog was running on highway just north of JP burns. I’m headed to properties nearby to ask residents however could you make a post to see if we can find the owner. I will have her for a few hours before I transport to our animal shelter in salinas. There is no collar on her.
I will not be in cell phone range but they can call our non emergency number (831)755-5111 so that my dispatcher can get a hold of me over the radio. 
Thank you 
Jesse.