Definately get a harness! You don't want to be pulling on his neck and wind pipe. they are prone to trachea collapse so don't want to excerbate this.
As to the cold! Mine dog is around 3 # grown. It is very cold here in Montana and she goes out fine. I do keep a sweater on her at night and in the morning. It can get 30 to 40 below zero here, so am a little worried about it. She went out fine at 13 below the other morning. She just does her stuff and comes right back in! I wouldn't leave them out. Of course, mine won't stay out without me anyway! Seperation anxiety to the max! Pat |