by little git i mean my dog! He has is a rescue and we have had him a few months, he has just started chewing things, and has just this morning chewed a £160 pair of glasses, i am now half blind 
We have been quite softly softly with him as he was a rescue and we don't smack our other dog so why should we smack him. But just now i caught him with his teeth around the lap top cable, obviously live!! So i have smacked his bottom - poor little guy looked at me as if i have betrayed him and i do feel awful but he needs to learn. The glasses, frustrating, but my own fault for leaving them where he could get them, i just showed them too him and said "who done that aggghhhh" in a stern voice but got the look of "it was me, me i tell yah, what you gonna do about it" waggy tail, is this a game mum?
We buy loads of chew toys, he has long walks, yet STILL he is a miniture weopon of mass destruction.
I feel bad, he is laying at my feet and just looked so hurt, it wasn't a hard smack at all, just a tap on his bottom and a yelled no, it was a live wire FFS!
It is becoming an issue though - and am hoping that maybe the odd tap might curtail? but of course, i dont want to cause him anxiety and then he will only chew more :( what to do what to do???