I'm in stitches reading this tread. LOL
But really.... it's not that funny. Does any of these dogs have names?????? Wouldn't it be easier to give the names instead of Big guy, little guy, new guy and old guy?
I love yorkies...and always will but I saw a baby maltese years ago and I fell in love. He was so small and I took him home and was told he would be about 4 lbs full grown. Welll...... my BaoBao has grown to be a whopping 12 pounder... LOL and he is a doll. Would never get rid of him.... sweet as pie and my yorkies all sort of pick on him but he a great boy! My point is..... it takes time to get the family dynamics and a week ain't going to do it. I have rescued yorkies before and placed them in wonderful homes. Some older dogs have never been with dogs and they need to be an only child.... in your case... this is a baby you took in. If you really don't want him...... it's better for him to find a family that will.
And I don't think people here are trying to give you a hard time but I guess we are look at things from the point of view of the dog.
Good Luck and I hope you let us know what happens to Big Guy.