Beautiful horse! He looks a lot like my neighbours horse Katie!

I had a pony with arthritis. She was 27 years old and also had navicular. Our vet put her on bute and it helped her a lot. I know theres some contraversy over it but Lady wouldn't have been able to have the life she did in her last few years if she hadn't had it. I was taking her cross country and showjumping until a week before she died from a brain tumour! Her arthritis only ever bothered her if she did too much work on hard ground, or if she didn't have the bute! I do hope you manage to sort something out with your horse though, he looks lovely
I have a horse now called Charlie. Here's a pic of him in the garden taken this morning
Here's an old picture of Lady jumping. She was 28 years old when this picture was taken and you wouldn't think there was anything wrong with her would you?

Oooh, and excuse me pulling weird faces in the pic, i was only about 11 years old