That hoof has got more going on than thrush. He's got a weak frog due to lack of simulation. The hoof looks like he's got long toes and underrun heels. His frog doesn't look like it's making adequate contact with the ground, which is what stimulates blood flow and encourages healthy growth.
If your farrier has been working on this horse for more than a few months, I'd find a new farrier. The thrush problems will be consistent unless the rest of the hoof is properly trimmed to allow proper hoof function. If you want any better advice on his feet, you could take good quality pictures and post them onthe forum for an in depth critique.
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