Originally posted by Toller 42
most dogs have under coats don't they? and alot of dogs get shaved my grandma's golden has an under coat and he is really hot in the summer, she usually shaves him and after he is shaved he doesn't get very hot.
Yes, I would say that the majority of dogs do have an undercoat. But there are also a lot out there that do not.

A lot of people do not realize this and unfortunatly a lot of groomers don't say anything cause they want the almighty dollar.

I'm have no idea why your grandmothers dog is not as hot when shaved. But I do know that the thicker the undercoat the more important it is to keep it, like husky's & the such.