The quick answer is no, you shouldn't shave your dog in summer. And this not only applies to the super furry Nordic breeds, but also to other double-haired breeds such as Australian Shepherds, Border Collies, and Shelties. These herding breeds have double coats that require regular grooming. Ideally, you should groom your Australian Shepherd at least once a week.
The tool used for grooming is specifically designed for dogs with double coats, making it ideal for Australian Shepherds. It's not possible to get an Australian Shepherd with short hair and a shaved Australian Shepherd won't save you from the house's fur. Daily grooming helps prevent mats from forming on the coat, keeps your dog comfortable, and prevents your house from being covered with fallen dog hair. However, for dogs with heavily matted coats, professional dog groomers often simply shave their fur to grow a new coat. Many dog breeds, including Australian Shepherds, pant a lot and rest in shady places during the summer to keep cool.
Although it's generally not recommended to shave the fur of Australian Shepherds or any other double-haired dog breed, there will always be exceptions to the rule. The charming Australian Shepherd has a rather complicated story, since he descends from shepherd dogs found long ago near the Pyrenees, transported to Australia to herd sheep in the open field and, finally, ended up in California, where they were adopted by the cowboy culture of rodeo artists. In conclusion, it is not recommended to shave your Australian Shepherd during summertime. Regular grooming is essential for keeping their double coats healthy and free of mats. If your dog has heavily matted fur, it may be necessary to have them professionally groomed.
In any case, it is important to remember that the Australian Shepherd has a long and interesting history that should be respected.