(I deleted your other post under Doghouse to avoid duplicates.)
Start by checking that your iPhone and your Mac are connected to the same wireless network. On your Mac, click on the Airport menu (the little quarter pie of lines that tells you the strength of your signal on the top right of your screen) and see what network has a little checkmark next to it. Then go into the Settings app on your iPhone and under Wi-Fi make sure that it is connected to the same network as your Mac.
If that's the case yet the connection still doesn't happen between the programs, try creating a direct network on your Mac through the Airport menu (that same little quarter pie you used before to check the name of the network). From that menu, select "Create Network", name the network whatever you like and press the OK button. Then go into the Settings app on your iPhone again and connect to that same network. Then restart the Pedias on your Mac try the sync in Pocketpedia again.
Doghouse is the Pedias' online database for searches. It's like any of the other search site options you find in the Pedia programs only it is built entirely for and by Pedia users from around the world. We always wanted to build a server like that since it gives us and our users much more power over the data available for the Pedias and since we've been having trouble with Amazon for the past few years (especially over Pocketpedia), Doghouse finally happened.
Pocketpedia3 on the other hand is the mobile companion app for the Pedia programs so that you can take your databases from the Mac along on the iPhone, iPad and iPod touch.