There have not been many studies to confirm dose, side effects and efficacy. But this is what I found.
... we have CBD from hemp which is legal to discuss. Product quality can vary. Dose is 0.1-0.2mg/kg bid. If no effect within 14 days, then raise dose in two week Increments to 0.5mg/kg BID. I like Rx Vitamins product, HempRx.
As in all of medicine we can use more studies. Pretty safe stuff. Try it and see if patient response is noted.
Also, there is a new nsaid available for dogs, I don't recall the name but I'll find out. It is as or more effective than carprofen, higher margin of safety, no liver or kidney effects and no monitoring necessary.
Doug, DVM