This could be anything from actual dog clothes like shirts and hats to special beds which are designed to help dogs with certain bone and muscle conditions (such as arthritis). (caninejournal.com)
Certain bone conditions can actually lead to premature euthanasia of your dog because their pain can't be managed past a certain point. (smartdogowners.com)
Bone marrow is the sponge - like tissue inside certain bones. (pregnancy-baby.com)