my late father in law used magnet treatments for his knee problems and found they really helped ,he also had a mattress topper with magnets in it ,he used them before and after his knee joint replacement op along with Arnica Gel from a company called SBC ,My mother in law uses a magnet wrap for her spondylitis in between her acupuncture treatments and shes remarkably fit foor mid eighties lilypollen you could try Actipatch on your dog ,although its made for humman use it gets fab reviews for pet use too,its electro mmagnetic and available at most chemists