As I have raised my puppies​​ I have learned quite a lot about the breed by observing and interacting with them every day of their lives.  I would like to note at this point that I am expressing my opinions based on the experiences I have had with my dogs over the years. 

As early as 3 weeks old you can see the beginnings of individual personalities in the puppies.  Even though their eyes and ears open between 10 to 14 days of age, they do not really notice each other until 3 weeks old.  Their teeth are coming in by then as well.  Lots of development is happening all at once.  Their ears are getting bigger, coats are getting longer and they are toddling around their bed better each day.  They start playing with each other by trying to bite each other’s noses off.  So cute.  This is the time I open a door in their bed so they can come out and piddle in a litter box. 

​As soon as their teeth start coming in it seems their appetite is more than their mother can satisfy.  They cannot digest anything other than milk until this point.  Getting teeth seems to be a trigger.  I introduce food to them in addition to nursing from their mother.  I think the dam is glad I do.  She no longer wants to stay in the bed 24/7 and is glad for a break from being the milk bar.  Her appetite increases as well as they demand more and more from her.

  Now the development seems to increase day by day.  Instead of lurching and stumbling, they start to actually walk.  By 5 weeks old they are pros at it and hardly fall over at all.  An interesting thing I have noticed is that as they become aware of objects in their surroundings they will zero in on something and go for it.  The difficulty with that is they are oblivious to anything in the way.  So they will run through the food bowl, water dish, over each other.  I use an x-pen to confine them.  In their desire to get to something of interest they will run right into the fence, almost like they could not focus on or see more than one thing at a time. They sure learn fast though.  You can’t bump your nose into a wire fence too many times before you become aware of its existence.  Sometimes they will get behind one panel of the x-pen and take a while and lots of whining before they discover how to back out and go around it to get to their destination.
 
Personalities start to show as early as 4 weeks when they are learning about their world.  I want all of my dogs to be outgoing and friendly and not be afraid of anything.  If I see one that seems to be shy I will put more attention to that one to be sure it grows with as much confidence as it is capable of.  Since I am careful how I breed my dogs, I have not had too much trouble with temperaments.  It would be foolish to breed an overly shy or overly aggressive dog.  Temperaments are an inherited trait just like any other.
 
By the time they are 8 weeks old they are masters of their domain and are excited to play with and chew on anything and anyone in sight.  The danger I see here is their habit of jumping up to either get your attention or attack your face.  I see them do this with the older dogs.  It is a submissive gesture and invitation to play.  They just wildly throw their bodies.  It is not much of a problem if you are on a carpet but a hard floor can be dangerous.  They can so quickly fall over on their backs and hit their heads on the floor.  So, for a few weeks at least, I put a heavy blanket on the floor for them to play on.  I get down so I am at their level and they get used to a human face right next to theirs.
 
If the weather is good I get them outside as early as 6 weeks.  Even in winter a few minutes out in the yard is a good experience for them.  All papillons seem to love the snow.  Rain not so much, but snow is great fun.  Their first introduction to grass is priceless.  They get all excited in discovering the smells and textures of the lawn, rocks, plants, trees, and anything else they can poke their little noses into.
 
At 7 weeks, I put collars on them so they can get used to the feel of something on their necks.  It takes at least a week to finally stop scratching.  At 8 or 9 weeks I put a leash on them, introduce them to delicious bait of roasted beef heart and start the process of walking on a leash.  Kitchen to family room, back and forth, doing my best to make it the most fun thing to do.  We also work on the table thing.  I put them on a pad on the kitchen counter and touch them all over even more than the judge will do in the show ring.  Both pets and show dogs get the same education.
 
I do have older dogs as well so the puppies get to interact with older dogs quite early in life.  As we play in the evening in the family room, I let the puppies out to mix with the older dogs.  Most of my grown guys tolerate the puppies just fine, even playing with them.  Some don’t want to bother and move away or growl at the puppy to stay away.  I supervise this play so no one gets hurt.  By the time they are 8 weeks old, all the dogs go out in the yard together to explore and play, supervised of course.