How old should a puppy leave its mother?
Any breeder that would let a pup go at six weeks is in the class of puppy mill or backyard breeder. A pup should be with mom and litter mates for 10-12 weeks. The pups learn bite inhibition (not to bite hard when playing) and socialization from each other. If you take a pup too young you will soon be back on here asking how you stop your pup from biting all the time.