Deb,
So sorry to hear that. I guess I am lucky to not have heard of 'Sand Fleas'. I have used the H&S on my dog and it seems to help her out. I wonder if something like Avon's 'Skin so Soft' could help out. It's oils could smother the fleas and repel them. Used to use on our dogs until they came out with K-9 advantix. I have heard even used dryer sheets kept around the neck repels gnats. I hope your sister had better luck.
Stush
