@Jelinga CSJ now do a turmeric tincture which saves making your own turmeric paste. I've read in other articles about turmeric that the black pepper, which is in this tincture, helps with absorption.
TurmerTinc Herbal Tincture 250ml Joint Aid also contains the active ingredient from turmeric curcumin. I've seen some very impressive results with Joint Aid in more than one fog and give it my two as a preventative. My friend's Rottie as an example was diagnosed with arthritis in her hocks when she was two. At about five years old she had difficulty with steps, jumping up on things, getting comfortable lying down and a permanent limp. The limp improved massively with the Joint Aid, she no longer had a problem getting into a lying down position and managed steps easily.
Joint Aid for Dogs - From £9.06
I hope Rourke is feeling better very soon.