LOL .... They ummm ... found their voice
Dogs bark for a lot of reasons
alarm
aggression
fear
play
and lots of others too
as puppies grow and learn new things vocalization and barking is one of the processes they need to learn about too
getting a barky dog to stop barking is tough
First is to distract them with a loud noise or a yell to stop them immediately
this is pretty easy to do but they will likely start in a second or two all over again
this is where the hard part comes in esp with vocal dogs like Yorkies
you need to get the pup away from the barking stimulus
whatever it is that is making him bark
you can do this 2 ways
first is take them physically away and put them in a different room or
you can body block him ...
which means you stand between him and whatever is making him bark
This is a long process and needs to be repeated again and again in order to change his habits