We got our pup from a rescue when he was 6 weeks old. It took some time. He did have worms and after the treatment for that he was a perky little guy.
I think getting an old shirt with the mama dog and litter mates scent is a great idea. Also try hand feeding your pup. It will strengthen the bond between the two of you. Puppy will associate you with its main life source.
Hang in there and enjoy your pup
Sent from Petguide.com Free App