I apologize that I am not a Yorkie owner, i am a miniature Dachshund owner however, I have problems with mice and have done and am still doing a lot of research on how to get rid of them while having my puppy.
After speaking with the vet and mentioning to her that I was told about the steel wood idea, she did agree that mice will not eat through steel wool, HOWEVER, if your puppy eats it, it is very dangerous for them. It tears up their digestive system and can kill them. So if you use it, only use is in areas that they don't go. Be very careful with it so that your little baby doesn't get a hold of it or you may get rid of both the mice and your little one.
Not worth it to me. I cannot stand mice, I mean CANNOT stand them. They aren't an insect you can step on...they are a critter and they are nasty but I would rather deal with them and keep my little baby alive than watch my little man suffer and die just to get rid of a mouse.
Use caution around your little ones. If you are like me, Kota is my baby. It is just me and him, he is my family. I mean I have a sister and mom and dad but in my house it is just the two of us. I am 30, not married and have no kids. He is my kid
If anyone has any other ideas about the mice, I am all ears. lol
God Bless Everyone and their precious pups