Flies appear every spring and summer, and while you have many ways to fight parasites around your horse, experts agree that an integrated system works best. In this type of agreement, the owner of the horse or the owner shares with a tenant the maintenance costs and the riding time of the horse. It can be a great way to save money on board, food, veterinary bills, etc. and it can be great for your horse if your own saddle time is limited.. . .