Children's Books discussion

I'm trying to locate a children's book series that was written in the 50s or 60s about a dog named Marco, who is like the ring leader for everything that happened in the stories. If you have any idea what this might be or who wrote them I would be very grateful. I've done the typical google, amazon, wikipedia, abe books search so far with no luck. Thanks!

Sorry, I don't know. But, I hope someone here will!

Braegan, If nobody here knows, you can always ask in this group: What’s the Name of That Book?

If you do find out, please come back and let us know!