Hi and welcome. You dont have to worry about a heating pad breeders do that for new born puppies. Six weeks is really young to get a pup but i got My Chachi at 6 weeks too so I am sure he will be okay just get some nutrical. His ears are probably not standing yet because hes so young. Chachis were not standing at that age either. And then sometimes they go up and then go back down when they are teething. I would just give it some time |