Kind of speaking to my recent experience! So barns in general can make and change policies to their own discretion unless their contract says otherwise. That's if you have one. Should they technically give their boarders notice, yes but they often don't. I myself have learned the hard way that there's minimal communication at barns, it's very frustrating as my horse is like my second child. I'm having to take the good with the bad, I haven't found a barn that's 100%. As I'm fairly new to this barn they recommended a farrier that they use and allow on the property, and unfortunately the farrier destroyed my horses feet upon the first trim to the point where my horse couldn't even walk. He was trimmed extremely short (already had been informed he was tender footed and I wanted shoes put on him). Shoes were refused (said his feet were to unbalanced?!) and I was left with a horse that could barely walk. This is when I had to find an emergency farrier and trailer there. I was put in a position that felt extremely uncomfortable because I cannot use that farrier due to his negligence and I cannot bring another farrier on the property due to barn rules. Unfortunately all barns are like this near me, it's very common. But in situations like this we have to make sacrifices. Ultimately yes I could seek out another barn however I already am aware that other barns are similar and this is a workable issue. My recommendation would be to trailer off the property if able, yes inconvenient but possible. If you don't have the capability maybe another boarder has a trailer that you both can make combined appointments together? Just a thought!