Here’s a new paper I’ve come across that shows free roaming dogs are less persistent with new object than pet dogs and captive dogs: The role of life experience in affecting persistence: A comparative study between free-ranging dogs, pet dogs and captive pack dogs
The theory is that increased human-dog interactions with the latter groups makes them more willing to investigate new objects, whereas free roaming dogs are more cautious of novelty. So not so much about persistence as willingness to investigate new things...

The theory is that increased human-dog interactions with the latter groups makes them more willing to investigate new objects, whereas free roaming dogs are more cautious of novelty. So not so much about persistence as willingness to investigate new things...