Well to keep my horse who was 16.3hh, her livery was £15 a week, £2.50 for a bale of straw and £2 for a bale of hay. Roughly in the winter i went through about 3 bales of straw and about 3 bales of hay a week that was on top of livery. i also had her food which was chaf, herb mixture, garlic, sugar beet & some weetebix i went through each bag about every weeks.then you've got shoeing if shod mine was £50 all 4 every 8 weeks. £120 for all her jabs and check ups every 6 months, vert bills if it goes poorly like mine it got colic and horse flu over winter. There is a lot to consider with horses, and you have to buy buckets, grooming kit, hay net, mucking out equipment head collar lead rope tack if not come with tack, i'd seriosuly sit down and think about financially and if your a re seriosuly commited at they take up a lot of time. if first buyer of course.