My 2 will not touch brewers yeast even the tiniest bit and protexin has never really made any difference, they both eat the oily herbs and the aloe vera fine though.
I have fed physilium husk which I think really helps with loose droppings so I tend to have it anyway and gut sponge has also...
Did they check the suspensories when the hock arthritis was found?
One of mine had hocks and coffin joints done in 2022 and his still ok, but he did have a bit of suspensory damage so he had laser on those as well.
Arabi has coffin joint arthritis I use hoof armour on him and I think it definitely helps when he went footy a while back after applying it he was fine a few days later.
Definitely rent the new place it looks lovely 🤩
It varies some want longer box rest because of a laminitis risk or at least reduced turnout, but on the other hand it does them good to move around so I think it depends on the horse really.
Friends horse started doing similar his only young he went to the vets couldn't find anything wrong, she laid off jumping and started doing a bit of affiliated dressage and actually does really well, she then started jumping a bit more and he was fine, his just one of those horses that likes...
My fields always look sparse after winter but they recover really well and in 12 years I've never seeded or fertilised, the gateway and little areas get a bit bare but the rest is fine.
I wouldn't fertilise if you have good doers or lami prone horses the one time I was on a yard that did 5...
I feed Arabi sucralfate if his a bit stressed or if he seems a bit grumpy or hay feed change basically any situation that can upset his gut, I can honestly say it totally makes a difference to him I can just see him settle down after only a few days on it.
My old horse once out 24-7 wouldn't be caught for about 2 weeks so I just left her and then she would walk to the gate when she saw me and then be fine after that.
Agree you don't sound like you have enough experience for a TB especially one that has raced, for your first horse you want a been there and done it type horse.