[Amazing Yorkies]

Are you sure it's not that cute little head turn when talked to??
Don't want to scare you... It may be nothing, but I would feel bad if I didn't say anything, and there was indeed something wrong.
I purchased a pup with a little odd head tilt to one side, and I took him to a Specialist. As it turned out, where the head and neck meet with the spine was developed wrong, and a wrong jump or fall can dislocate that area resulting in needed surgery. He said he sees that occasionally in Yorkies. There was a Yorkie there at the time, that had fallen off the bed and was about to have surgery.
I also had surgery on this little guy before any accident made it worse. The breeder replaced him with a different pedigree, (just in case) and let me keep him as well.
I have also seen that with Hydrocephalus (water on the brain, usually has protruding forehead, or bigger head).
If it is that noticeable, I would have it checked.
Good luck and let us know!