Hi Dan, and thanks for your post.
It sounds like you are doing all the right things with your dog right now. As I'm sure your vet will have explained to you, a positive cranial draw test is usually a sign that some damage has been done to the cranial cruciate ligament, as your dog is not in a lot of pain or lame it is likely that he has only damaged it a little rather than rupturing it. When dogs damage their cruciate ligament care needs to be taken to protect the joint to prevent joint disease and to allow the body to generate better support for the knee joint again. It is also important to prevent the tear becoming a rupture as ruptures almost always require surgery. All of the conservative therapies your vet has prescribed will be aimed at achieving these things. Ligaments can take an extremely long time to heal so you will have to keep up your therapies and limit strenuous activity on the joint for a long time.
Having reduced activity can be really hard for many dogs so you may have to get a little creative with ways to keep your dog challenged. Swimming is an excellent exercise for this sort of condition as it is very low resistance, your vet may even know of an animal hydrotherapy pool in your area which is a great place to start. Also try keeping your dog occupied with tricky toys such as treat balls and kongs. All of the mental exercise required to get the food out will help use up some of that extra energy.
Make sure you also take your dog back to the vet clinic every now and then for a recheck of your dogs joints. This is important because not only may your dogs joint have improved or require different therapies but it is also common for the opposite leg to become affected so this needs to be monitored also.
I hope this helps and if you have any further questions don't hesitate to ask.
All the best,
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