I want to thank everybody for their helpful advice for Brutus.
I would like to share some vital information that I have stumbled upon in my search for answers. Brutus was neutered before he was 1 yr. old. When our animals are spayed and neutered they are stripped of their natural hormones that affect everything from bone marrow to bladder control. When humans have surgeries that diminish hormones, we are given necessary hormone treatments. Animals are not. All of the problems that Brutus is facing can be directly related to having no testosterone in his body for 12 years. Rimadyl is a hormone that stopped his pain but caused his incontinence. If Brutus was given testosterone at this stage he would be in extreme pain but the incontinence would stop. If you neuter your large, male dog when he's young, he will be over 50% more likely to develop osteosarcoma (deadly bone cancer) than male dogs that are not neutered! We put our animals through the torture of these operations because we've been convinced this is the best thing we can do for our beloved pets but these accepted, "standard" procedures strip them of the hormones they need. If you're thinking of getting your pet spayed or neutered, ask your vet about hormone treatments. I've never heard of any but maybe, if we're all aware, we will one day be able to change this barbaric treatment of our loved ones.
I would also like to let everybody know that since May 29, I have tried over 30 different supplements and remedies and I am finally seeing his cancerous forearm shrinking! Brutus now gets 1/4 tsp. Himalayan salt (unprocessed sea salt) in his water twice a day and a little sprinkle of it on 2 meals. His first salt water was given to him on Sun. July 14. His forearm looked like a baseball bat. It was huge, hard and no definition. Today, July 19, it has shrunk to less than half the size it was and you can see the definition again. I went to watercure2 that was referenced from earthclinic and I believe it's saving Brutus's life! It is also known to help arthritis and many other ailments. It's the least inexpensive thing and so easy! Brutus is walking better, his appetite is back and he's acting like himself again.
Thanks to earthclinic and all the caring people that tried to help Brutus.