I would start with PROMAXOL. It helps to decrease pain, inflammation, and stiffness and stimulate healing. Initially I would give a half dose with breakfast and again at supper. After improvement is seen you can decrease to a whole dose once daily. For longer term management you can switch to ARTHRO-IONX. In addition I find it helpful to follow a holistic approach by giving nutritional supplements to accompany the homeopathic. I would also use PROBIOTICS and OMEGA 3,6,9 to reduce inflammation and strengthen the body. What type of food and water are you giving? Where do you live?
I would also suggest an evaluation by a veterinary chiropractor. If a correction is needed, that can help with better movement. Acupuncture is also helpful. You need to address this quickly since it is important that your dog maintain mobility. Getting a harness with handles is also helpful in allowing you to help your dog rise and move without straining your back.
Looking forward to your reply.