I confess I hadn't heard that before. The first time we shaved him we had to, we'd just gotten him from our neighbor who shouldn't have dogs, his fur was so matted it was creating soars, and his skin when you got through the mats was black with fleas. The next summer I didn't plan on shaving him, but by mid summer he was moppy and always panting. We gave him a summer cut and he was up and running with the rest of the dogs, so I usually try to get him cut at least 1-2 times per summer and he seems to be much more active and less hot than when he has his full coat.