I am the proud owner of three Newfoundlands.I have read countless topics about shaving these dogs in the summer. I would like to say that I have rescued Newfies that had to be shaved down to the skin due to neglect and their fur grows back just fine. I am not a breeder,just a rescuer. True that if you shave a dog and leave them out in the heat they will suffer.. the coat is for protection..anything would.My dogs stay indoors with me when I am here and kennel up in an air conditioned room when I not. I take the hair down to 1 1/2 inches in the summer and by winter they all have full coats. I consider myself a responsible owner..I will challenge anyone who thinks different.
I had groomed 2 for years, they have recently gotten to old to handle the standing. We would do them once a year, and they pretty much lived outside. It was never down to the skin, we left them with about 1/2" of hair, they always did great. I have shaved everything from Labs to mixes. I don't see anything wrong with it. I have only seen one lab mix that was shaved every 8wks his entire life stop growing hair when he was old. It wasn't all over, just in patches. Out of 13yrs of grooming that isn't bad odds if you ask me.
Newfoundlands have always been my dream dog..now I am blessed with three.They are a handful..I brush two on Monday and my third on Tuesday..then repeat.I've found that clipping the female to 1 1/2" in the summer has gotten rid of hot spots.My oldest male is clipped the same but his fur hangs a bit different.The youngest (chocolate) has very thick fur and it is very wavy.All three swim as much as we let them so the shorter cut helps grooming time.