I can agree with Doc E on this one. I have a 13 y/o who has several fatty deposits and has had them for about 6 years. He has never been overweight, always a bit on the skinny side.

They have nothing to do with overfeeding.

Although 167 lb dog is very overweight, the overfeeding may not have caused the fatty tumors but it sure can cause a lot of other problems if you're not careful...heart, liver, joints, etc.