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  I skipped through to the end of the posts so I don't know if anyone has gone into detail on raising a young pup.  I had to had raise 5 baby girls at only 8 days old.  It can be done.  I would recommend a heating pad under a blanket because there are no siblings to help keep each other warm, keep the temperature set on low.  You should be able to remove the heating pad in another week or two.  Get a good supplemental milk, recommend liquid from vet instead of where they sell pet supplies.  You will need a puppy bottle.  What I did was sit on the floor with the pup in my left hand, laying on my knee with my fingers around their mouth, more so to keep the nipple in but also to help give the feeling of skin touching their face.  Oh, I'm right handed.  I place the heal of my right hand as close to their chin as I could get it.  I feed every two to three hours and keep track of how much they are taking at each feeding.  I introduced soft food at 4 weeks once a day, mixed really thin with the supplemental milk and put on a saucer.  Of course the first couple of feedings I had to stick their mouth onto the plate.  It was a total mess but they caught on real fast.  And most important, after feeding be sure to take like a warm wet paper towel or a cotton ball and wipe their private parts to stimulate them to pee and or poop.  I also washed their face and body with a wet cotton ball.  Anything you can do to simulate a mother dog will be very helpful for the development.  
 Having said all of that, what kind of a breeder would let a pup go at 4 weeks old?  I can't even imagine!!!!!!!!!  Heck, I have a difficult time letting them go at 10 weeks old.  They need the doggy interaction that humans can't provide.  Because we had other yorkies, our baby girls got plenty of interaction.  We brought Feebie home from FL at 5 weeks old and only because we were expecting a litter that week.  Feebie never did take to the litter or mother.  I would never, ever, do that again unless something happened to the mother dog.
 
 I wish you much luck.
 
				__________________Linda and her  Baker's Dozen, RIP   my angels Reggie & Bo  |