As of my last knowledge update in October 2021, the main members of Paw Patrol include Chase, Marshall, Rubble, Skye, Rocky, Zuma, and Everest. However, there are characters who have appeared in various episodes and specials that could be considered additional members, but they are not official members like the main seven.
If there have been new characters introduced as the 13th member since then, I wouldn't have that information. You may want to check the latest episodes or updates on "Paw Patrol" for the most current information.