I think I would be uncomfortable doing chiro on a dog with bone cancer. Loca had chiro until the end, which I've always regretted because it seemed to increase her pain directly afterwards. She didn't have bone cancer, but she did have problems with her neck and back. I would be afraid of doing more harm than good. I paid $19 per treatment every other week, which was done by a vet.
I haven't had acupuncture done on a dog with cancer, but I've had it done on a dog that had a stroke. It seemed to have helped, but it was hard to tell if the results would have been the same without it. I've had acupuncture for a bad shoulder injury and it definitely helped.