I have a McTimoney Chiro who is fab, he comes out every 6 weeks for Skippy (but that's because of a specific issue which Skippy has due to an injury before I bought him) and although Soda only really needs checking ever 6 months, given that I pay a set call-out fee plus extra per horse/treatment and chiro doesn't charge me if nothing really needs doing I do ask him if he'll check Soda as well every other time or so depending on whether I think something needs doing.