The discussion here has presented some of the issues with using CBD in animals. The legality sometimes may rely on the interpretation of the legal authority you are dealing with. State laws are in direct violation of federal laws regarding marijuana.
Anecdotal evidence has been very positive regarding CBD use in dogs. The problem is that it's use is new enough that we really don't know optimum doses, dangerous doses (although this does not appear to be an issue), long term effects and appropriate uses. There is a lot of research being done right now and we're getting information rapidly.
The other issue is that the OTC forms are not regulated and tested in many cases, so you have to be careful about sourcing. You may or may not be getting what you think you are.
With firework season coming (already started here :() I'd be interested if anyone has had success in use relieving anxiety with fireworks.
Doug, DVM