Jackson's lab results came back and they weren't good.
He has Cushings, although it must be in the early stages because he shed out his winter coat well. It did seem extra thick to me this year, but I figured that was just him adjusting to our Sierra climate (which is significantly colder than where we came from in Southern California). Other symptoms of Cushings include frequent abscesses, drinking copious amounts of water and laminitis. Although he isn't currently laminitic, he has a history of that in the past. And he has more pee piles in his round pen than are normal so he is drinking a lot.
He also has abnormal thyroid levels.
His insulin levels are normal, though.
So, Jackson is now a highly managed horse.
He's on multiple medications; five in total: thyroid (2 meds), Cushings (1 - pergolide), and circulatory for his feet/navicular (2 meds).
He is wearing special boots at night to increase circulation in his feet for the navicular.
He will be wearing special shoes and hard pads to protect his thin soles. My fingers are crossed that the shoes stay on. His hoof walls are thin and weak. Maybe our farrier can use glue on shoes, if traditional ones don't work. I'm still hopeful we can get him comfortable, but it may be more challenging than I anticipated.