Does your dog have fatty tumors? Have they been aspirated (needle) by your vet to be sure they are fatty tumors and not possible cancerous tumors?
I have recently heard of liposuction to get rid of lipomas and avoid surgery, (which is more dangerous when dealing with anesthesia).
Here are some good sites to check out.
I have a friend who will have this procedure done on her Labrador in a few weeks and I will take note of the results, recovery, etc. and update here soon.