Gavin
Last year I rescued 2 old goats, at the time they were in a dreadful state and we thought they were here to die. 7 months on, a huge vets bill, a lot of TLC and even just food - they are in a terrific state and bring us great pleasure. Rosie is a 2 year old Golden Guernsey cross and she could barely walk when she arrived, now she jumps fences and eats enough for 2 and is generally a very happy girl. Anyway, she suffers from arthritis and we give her some "Danilon Equidos" which is for "pain and inflammation associated with musclo-skeletel conditions" - in horses but it does do the trick. Every 2 months or so she also needs an anti inflammatory injection from the vet but as soon as she gets it you see the difference in her.
This comes in a powder form and to start with we sprinkled it in her food but she refused to eat it. Then we cored out an apple and hid it in that but after a few days she got wise to that too. Even now she refuses a bit of apple as she remembers! Now she gets it, every second day. We give her a "piece on jam" with the powder sprinkled on and months and months later she has never wise up. I hope this helps, good luck.
James