Great questions and as with all dosing, it really depends on the patient response.  In general, we prefer to give the full dose to either spot as studies have shown that too little or too much light per spot results in slower healing.  In this case, I'd treat 60 seconds per spot rather than 30 seconds in twice the number of spots.  A few ways to get more treatment in are: Treat different spots in alternating days (e.g. hip one day and knee the next) Putting the device into a ziploc and in the fridge, to keep the device cooler during treatment. The key with MedcoVet is that because treatment is so regular, you can always try different setups and see how the patient responds.