I have a 9 year old gelding diagnosed with Kissing Spines in December. I was given him after this diagnosis as he was going to be shot, and having dealt with and ridden the horse previously, and always utterly adored him, I felt he deserved every chance I could give him. Before I had him he lived in almost all the time, the yard had very, very limited turnout. He has hunted most of his life and been worked hard, I have known him for about 2 years and throughout this time he's always had 'a dodgy back'.
He is, somewhat unfortunately in this situation, the type of horse to get on with it, and make the best of a bad situation, so it's unclear how long he's been affected, during these two years he's competed successfully at unaff' dressage, winning a great deal. At the time I got him however, he had totally lost the plot, he was attacking everything that walked past his door, trying to come over the door. When ridden he was crashing through every fence, eventually getting to the point where he would just stand and refuse to move. He was taken to the vet where his previous owner was advised he probably had kissing spines, she was told to work him until he broke down to ascertain this was definitely the cause, as she was unwilling to shell out anymore money on him.
She decided to have him put down, but I intervened. A friend of mine competes at the highest levels of showing, and had a 12.2 HOYS pony diagnosed with KS, the owner was advised to pessoa this pony every day for 8 weeks, this was done about a year ago,and the pony has had no further problems, coming 5th this year at HOYS with a ten stone rider on, and not only that, but has just passed a 5 stage vetting!
My boy has been turned out for 6 months to forget the awful time he's and have a good old fashioned holiday, he's on joint supplements and is the happiest horse around, he follows you around the field now instead of lashing out. I'm due to start the same pessoaing treatment that was so successful with my friends pony shortly, and will update you how it goes. Sorry for the essay, but there seem to be so many horses affected with this currently, my own vet has even claimed that many vets diagnose KS if they don't know what the true problem is, I know people who have come through it, so don't lose hope!