If you find yourself in the unfortunate position of having broken down in your horsebox it can be tricky to know what to do for the best, especially when you have your horse on-board too. It is vital that you make sure you are prepared for a breakdown by ensuring that you have appropriate horsebox insurance and have also included breakdown cover. Below are our top 5 tips on what to do if you breakdown with your horse on-board: About SEIB SEIB have been arranging horse insurance for over 50 years. This experience allows us to tailor policies to suit your circumstances.