I've used CBD for my dog and found it pretty beneficial for easing anxiety, especially during thunderstorms and fireworks. But I'd say the effects can vary depending on what you're treating, such as pain, anxiety, or other conditions. The dosing part can be a bit tricky since it depends on the issue you're addressing, the size and weight of your dog, and the concentration of CBD in the product you're using.
Interestingly, CBD is gaining some traction in human medicine too. I was reading up on releaf.co.uk, and they discuss the efficacy of medical cannabis in managing symptoms of endometriosis, like pain and inflammation.