Our dachshund had to have back surgery when she was 3 years old. Because of this she was never very playful but she got around okay even if she had to take it slow. By the time she was 10 the slow degeneration of her back legs was such that half the time she was more inclined to drag them than actually try to walk with them.
A breeder we know said that Glucosamine treatments might help her so we went looking and settled on Glyco Flex to try. Within a week we could see the difference in her ability to walk and after two months she never drags her legs again. She still takes it slow but we have begun taking walks around the yard again.