Roundworms and hookworms are very common in all puppies. Even when treated, they will sometimes re-surface. As long as your baby is treated it will be fine. They probably re-surfaced in your baby because of the age at which you got it, it wasn't done with it's de-worming schedule yet.
 
I have to say this though...I am aggravated at all the breeders out there that I keep hearing are letting pups go at 6 wks old. You'd have to tie me up and physically take a pup from me at 6 wks, not to mention if you could get past their mother who would go totally nuts. I just don't understand it. Is money really that important to some people or are they just lazy and don't want to properly raise their litters. Probably both. 
I am not directing this at you SDPhotogrl...by no means. I am directing this at all the breeders who continue to do this. I am very happy for you that you have a new baby to love.  
