If your friend can find a good one in your area, I HIGHLY recommend working with a Certified Small Animal Massage Practitioner.
Massage does not heal the body, but helps the body heal itself. Here are a few of the ways massage could help your friends dog:
The lymphatic system is responsible for re-integrating the 10% or so of fluid that normally leaks through the veins and reducing the fluid from swelling at an inflammation site. The lymphatic system is similar to the cardiovascular system in that it depends on lymphatic fluid (like blood) and lymph nodes (a little like veins) . However, the cardiovascular system has the heart pumping to provide circulation, where the lymphatic system depends on the movement of skeletal muscles (limbs) to provide circulation.
When a dog is unable to move, the lymph system can't do it's job of reducing swelling and eliminating toxins.
1) What a massage practitioner will do is Manual Lymphatic Drainage, which is manually moving the lymph fluid through the body through massage. Not only will the swelling decrease, it will give his immune system a boost, and release endorphins.
Also, when a dog isn't moving their muscles or has gotten used to moving in an unusual way, the fascia (the connective tissue that covers and connects all the muscles and attaches them to the skin and bones) can dehydrate and form new connections, making it difficult for the dog to regain a fully effecient gait.
2) Massage will reallign the tissues and break up the fascial adhesions, removing trigger and stress points and allowing the dog improved range of motion and eliminating referrred pain patterns.
3) Massage will also help deal with any pain using the 'gate theory.'
In a nutshell the 'gate theory' is that pain is one of the slower sensations to reach the brain. Heat, cold, pressure and proprioception (body awareness) are all faster sensations. That is why when we get a paper cut we put pressure on it. We aren't going to bleed to death from a paper cut, but putting pressure on it blocks the pain. Or why when you wave an injured finger around it hurts less because the brain is constantly re-adjusting it's perception of where your finger is, and since the other senses are already in the brain, the 'gate' is 'shut' to the pain sensation.
Massage will also have numerious other benefits, but those are the first ones I could think of w/o knowing the whole situation.
Good luck and good thoughts to Zippy, he looks like a real cutie.