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Ok thisBut 8 weeks is better in my opinion.Because the breeder can switch them to solid food for you. 3 and 6 weeksLabrador puppies should be weaned between 3 and 6 weeks. It is a process that begins with introducing puppies to a warm canine replacement milk and puppy mash at 3 weeks and then slowly reducing how much time they spend with mom to eat. Puppies should be eating dry puppy dog food by 6 weeks old.
Wolters says in Waterdog that 49 days is the best. I am not sure it matters a ton but that's what my dad and I have always done. Its worked. Theory presented in the book is at 7 weeks the pecking order in the litter has not been established so you get a blank slate. No bullies and bullied.
Wolters at his core was a writer. He was not a dog trainer who decided to write a book about the years of expertise he had gained. His books water dog came out in the early 1960's and much has changed in the way professionals train dogs. In his books he doesn't cover ecollar conditioning or force fetch which are modern tools and building blocks for retrievers today. If a person follows one of the more modern programs they can take their dog way farther than they could if they just followed Wolters program. I am saying this as someone who as a teenager trained two labs following Wolters. They were fine dogs but once I started using Smartworks my eyes were opened (written by a 2x or 3x Field Trial winner). Many of these authors are active on internet forums or available by phone for consultation if you have issues during your training. The differece in methods and technology used would be like someone saying "I want to type a letter" you could hand them a type writer or an internet connected computer. The job would get done but one can go much further with greater ease using the computer than the type writer.