What this means is: do not shave your Sheltie! It's a mistake to think you're helping your dog stay cool, particularly in summer, when evolution has provided them exactly what they need to survive. By stripping them of their natural ability to heat and cool themselves, you could be doing them harm.

Should I cut my shelties hair?

The sheltie's long, thick hair will cake and mat with fecal matter if not properly trimmed, so cut the hair down to avoid excess mess.

What dog breeds should not be shaved?

The “no shave” rule doesn't just apply to super-furry northern breeds like Samoyeds, Huskies or Malamutes, but to other double-coated breeds as well. Herding breeds like Aussie Shepherds, Border Collies and Shelties are double-coated. So are Golden Retrievers, Newfoundlands, Bernese Mountain Dogs and many more.