As far as I remember from Archus (check his posts)
he said you should not combine the cottage cheese/oil with other treatments.
I would get the licorice capsules, I usually put them in some organic hamburger.
As far as pain at that age I would just give any pain medication that works. We had to do that with our dog when he had bone cancer. We did not want him to suffer, though we are against medication in general.