The condition doesn't match any of my experience other than what I have already noted. At 6 yo, I'd say it is unlikely that there is cancer, but it takes a biopsy of some tissue to be sure.
I have no idea/knowledge about "stress knots"... if it matches that could be it and hope someone else with more experience chips in.
hes only 6 years well turning six in aug. he is over weight hes a very short dog bu he weighs 50-60 pounds and hes maybe about 2 feet from head to floor give or take a little
How old is your dog?
If young (I'll say under 8 years), I think cancer is unlikely.
We had a Golden that developed fat pockets on his chest.. they were cancerous. He was 12 years old when we put him down, chemo/radiation didn't seem to be a good alternative.
I relate my only personal experience with cancer, and the dog was at life expectancy and the growths/tumors were fatty... not hare, and were in the chest/stomach area.