This may work- Finger toothbrush gloves. I got mine at Doctor Fosters and Smith. I noticed that even the finger toothbrush was still a little too large and uncomfortable for my Yorkie and Chi so I tried these and they work beautifully. Since it's a glove I have a better feeling how soft/hard to brush and it seems less invasive to the dog. Just though I'd share. It's disposable but I just wash them afterwards and re-use then until I feel it's time to switch.
http://www.drsfostersmith.com/produc...pc=1&N=0&Nty=1