Our Maltese at the age of 9 had WSS. I learned that there are many vets who do not know about WSS. We took him to a neurologist and wihtin 10 minutes he knew it was WSS. The vet placed him a steroids for about 6 months reducing it as well. Our little finally stopped shaking and was taken off all meds. Blood work should be done to check levels of the liver, etc. while on steroids. I would suggest if your pets have WSS that maybe a visit to a neurologist would be helpful to you. It takes time for the meds to show any improvement.
I found one key to WSS if they are shaking and when resting meaning sleeping or just laying on the floor and while the head is down the shaking stopped. It could well be WSS.
Our little one's shaking started out slow and not often - then it was constant.
I would suggest reading all material on WWS if you think or your pet does have this. ... View related article.