Bookdog is installed like most other Mac applications downloaded from disk images. Once you've done it, you're a pro, but if Bookdog is the first application Disk Image you've ever downloaded on a Mac, this page will help you out.
(You'll need an older version if you have Mac OS 10.3.9.)
Doubleclick on the Bookdog folder and you'll see several files. Hold down the Bookdog with your left mouse button, drag it to the Alias of your /Applications folder and let go.
To see and use it, activate Finder and in the menu click Go ► Applications.
A window to your /Applications folder will open.
If you have lots of apps and trouble finding Bookdog, type "Bookd..." into the search field.
Once you've found your Bookdog, doubleclick it to launch.
Unlike Windows applications that typically open with a big splash, Mac apps launch quietly. Look at the top left of your screen. You should see the word "Bookdog", indicating that Bookdog is active and waiting for your instructions.
In the menu, click File, open some of your bookmarks in My Macintosh Account and see what Bookdog can do with them. The bookmarks from each browser are shown in a Bookmarks Document. If you have bookmarks in del.icio.us™ or Google™ Bookmarks, you can access those in the Web Service submenu.
In the Maintain menu, you might want to try Sort, Analyze, Fix Duplicates, and Verify. If you want to migrate between browsers or services, in the File menu click New Migration.
After you have opened some Bookmarks Documents, click in the menu Bookdog ► Preferences and set Bookdog's behavior to suit your liking.
After you're sure that Bookdog has been installed OK, go back to your Downloads folder and trash the folder that it came it.
If you chose the .zip download, also trash Bookdog.zip.
(Bookdog's "internet enabled" disk image has already been automatically trashed, and the disk image has been automatically dismounted for you.)