Well, i didn't read what others said, so they may have said this already but the fact is it looks dumb, along with many other things. the over-coat is what protects the dog from the water, and the sun. so, you may have more problems on your trip than over heating. if he decides to jump in the lake, it might take him forever to dry, and may even get cold. (is he a wimp?) he may get sunburned, so get a bottle of doggie sun screen to carry with you (they sell them at the vendors at shows and petsmart) if you show your dog, you should NOT shave the dog. it damages the coat, and it may grow back curlier, or it may have random white hairs were there shouldn't be white. chalk may help, but that is technecally (SP) illegal, and it takes forever.
i know there are more, but i can't think of them right now. i shaved Sammie a couple years ago, but he looked retarded, and it wasn't really worth it for me. then again, Sam, is only half newf, so it might look a little better on a full newf.
Leah