There is even how to open a door. Not that a yorkie can but could you just imagine....dog would hit the refrigerator all the time
. I am not sure what tricks he knows I am guessing he knows the basics. I love the one where he can identify all their toys.
Give each toy a name. Play with the toy keep using the toy name, tug or pink whatever you call it. Hold it saw want tug. Touch tug. If he touches it give him a treat. Throw the toy(tug) Say go get tug. If he responds to the name and goes gets it give him a treat. He will start to know all his toys by name and be able to pull that toy out of all the rest. Continue to do with rest of toys. Any one else plays with him should know the names of toys too
Good luck