[hamiam]

Two ideas come to mind. Its a good idea to have your dog don a pet life vest. These usually have a harness build in and you cud winch him aboard with this. Also, Ive seen various dog boarding ladders. One is made by nauticalcreations.net and another is on the petclassics.com website. Ive seen dog ramps made from hinged pieces of plywood with floats attached to the bottom. If you do a google search I''m sure you will find a dozen more.