Lol, superstition does make people feel better (I know, I have OCD)
Honestly though, I would think shaving a dog would make its skin more sensitive/vulnerable.
The armor-factor would concern me more than "overheating" does.
If you breed long-winded dogs, you don't have to worry about it when things go awhile
As far as the "weight" goes, I didn't say anything before, but there is NO WAY that "dog hair" weighs half-a-pound
It very likely weighs less than an ounce ...
Jack