CBD for dogs

My dog is an older dog. Slightly on her way out. Starting to stumble here and there at some points. I researched cbd and if it is safe for dogs, and from what I found it is. I’m here to also ask other dog lovers their opinion with this post and if it is a good idea to aid a dog that I care so much about with a little cbd oil in their diet here and there? If so how much and most importantly if it is helpful, where in Orange County may I find some? Closest to Tustin would be preferred. Thank you for your time.