My boxer was diagnosed with a grade 3 mast cell tumor after a lump was removed from his ear July 1st. It was the only lump and they got clean margins. He was put on Benadryl then taken off even tho she said there was a good chance it could spread. We put him back on two weeks ago when he developed another lump. And then added Tagamet a week ago. It continued to increase in size so I researched cannabis and made some RSO Monday. They say if you stop the Benadryl/Tagamet it may make things worse. Can he be on the RSO with the Benadryl/Tagamet or should he taper off those and only use the RSO? He started RSO Monday night has had three doses and seems to be tolerating it well.