Vice put together a great video to help you understand if you should give CBD to dogs.
Quotes from the Vice Article
There’s not a lot of research on CBD’s effects in humans—let alone in dogs—but researchers generally agree the chemical is safe. The most popular uses of CBD in animals are to reduce anxiety, alleviate pain, and control seizures. Anecdotally, CBD appears to be effective at helping dogs with these conditions, although, given the nature of the patient, a lot of its effects are open to debate.
The only indications that the drug may be working in an animal are behavioral changes—if the dog stops limping or whimpering in pain, or stops freaking out from anxiety when left alone. CBD acts on more than 65 different types of chemical receptors throughout the brain and body, such as serotonin receptors, which are implicated in depression and anxiety.
Despite the dosing conundrum, there are no known risks if either you or your dog take a bit too much CBD. This is in contrast to THC, which can be toxic for dogs at high levels. CBD is non-toxic and non-psychoactive, meaning it’s not going to get your dog high and is unlikely to cause any negative feelings of anxiety or paranoia like THC can