I am sure this has been asked before, and I'm pretty new on here. But I wanted to know... I have a 4 month old Golden retiever and I wanted to know when is it to cold to put him outside? It's obviously winter now... he has been an inside puppy so far, but we are thinking of putting him outside while we are at work and things.... What would be to cold to leave him outside... I know its a different story when he has his full coat but right now... at 4 months... well ya know he is still little.... what do you guys think?