OK, a few things you might consider. What I would've done was create an EClark1894 folder for the Geometries folder, and make 2 separate subfolders, one for the Dog Collar and one for the Frisbee. You don't HAVE to do that, as anything else you create can also go in the same folder. Since folks don't access the Geometries folder directly, it's not as essential, so just a suggestion. It seems you used folder names from the HiveWire setup, so folks who download this from ShareCG, and who aren't regular members here, are going to wonder what those folder names mean.
As far as the Props folder goes, I, again, created a folder called EClark1894, and placed the .pp2, .png and .xmp files inside. In this case I made 2 separate folders, one for the dog collar and one for the frisbee. Doing that allows you to name the folders fully, IOW, Dog Collar For The HiveWire Big Dog, and Frisbee For The HiveWire Big Dog. I realize the Frisbee can be used with any dog, but you made it with the HW Big Dog in mind. Doing this, of course, would mean you'd have to edit the path in the .pp2 files to direct the call to the separate folders, if that's the direction you decide to go in, but definitely to the EClark1894 folder, and not just the general Props folder. Oh, and I don't think you need to include the .xmp files, as I'm pretty sure Poser recreates them automatically.
EDITED TO ADD: I just realized something . . . these are props, so I don't think there IS a path to the .obj files in the .pp2 files, so ignore my comment above about changing the path. That's true for .cr2 files. In fact, I'm not sure the .obj files are needed at all. I'll test that theory to be sure and get back to you.
The only other thing I'd recommend is to name the ReadMe file for the Dog Collar and Frisbee. I made a separate folder for you so I can add any further ReadMes for your future products, but if you don't want to do that, just editing the name of the ReadMe file itself will work. The only time a separate vendor folder is needed is when there are lots of products, so maybe down the road it might be essential, but not necessary right now. ReadMe files aren't directly accessed through Poser, so not that necessary to be in separate vendor folders. It's just easier for folks to find them if they want to read the ReadMe file, or if at some point you need to include a tutorial in .pdf format.
Oh and once you're ready to zip it all up, go through and delete all the empty folders, as they're not necessary, and just take up room in the zip.
Hope that helps some.