One thing to remember is that no keep is perfect and no keep or plan should be carved in stone. The dog dictates the frequency and the amount of work each day. A written down keep is nothing more than an outline of the types of work. Instead seeing them written down 'mill for XXX amount of minutes on Monday and hand walk for XXX amount of minutes on Tuesday and swim XXX amount of minutes on Wednesday'. I would rather see 'hand walk your dog til he gets tired, mark the time, wait for his recovery and walk him some more. Then improve upon these times gradually. And use this method for whatever exercise one is using.
Not just Jack's keeps, but anyone who has one written down, if it is written some new guy will follow it to a "T", regardless if it has ill effects on the dog.
My advice would be allow your dog to rest until his leg issue is resolved, regardless of what the plan or the chart says do, even if it means postponing a planned gathering. Continuing with the course with the dog in question will result in trying to show a three legged dog. Best of luck. EWO