Do exactly the same with my collie for the same reasons When she comes back she looks like a greyhound
We used to have a West highland White terrier, who we had to shave every few weeks in the summer to keep her from being damaged too badly by the heat. Only issue with shaving is if your dogs have light skin they can get sunburned badly very easily. Small dogs are easy to shave for the most part though (as long as their nails are clipped before hand).