I have a 10 year old dog that can't take any NSAIDS. She had CCL surgery a few years ago and I have her on extra-strength Glucosamine which had been working well, but now she is limping a little more. Tramadol helps but I would like to try CBD oil. Anyone have recommendations for certain products? They are not cheap and I want to make sure I am not getting scammed and they are as pure as possible.