If he'll eat them, yeah. Put as much salt on those things as you like. You can actually become salt deficient, believe it or not. And as CFers sweat so much damn salt, you won't hurt him by allowing him to eat it. I've always salted whatever I want, and as much as I want, and no one stops me. <img src="i/expressions/face-icon-small-smile.gif" border="0">
Oh and if you mean one of those little salt packets that McD's has... one isn't even that much. I'll use like 5 or 6 (easy) for one thing of fries.