There are a lot of pet products out on the market today that are CBD derived from hemp. My personal experience is with the brand Treatibles which helped my 10lb dog immensely in his last two years of life. Treatibles did a fantastic Ask Me Anything for HelloMD with us last year where people asked a ton of questions and the founder and tram answered. you may find value looking at the Treatibles page and reading through:
There are also products on the market that are ‘whole plant’ meaning they contain some THC and other cannabinoids. You will need a medical rec to purchase and it is only available in some states. Treatibles ships nationwide.
Dosing is dependent on the product and the animals size. It is hard to give too much CBD if you look at the recommendations it should be fairly straightforward.
I hope this helps!