I would definitely get his teeth checked (make sure the vet sedates so they can get a really good look). My boy needs his teeth done 3 times a year, so the once a year is a baseline but each horse is different. I'd also get a fecal done- he may have worms that are resistant to the type of dewormer you're using. If those don't work, you may want to get bloodwork done to see if anything shows up :). I would definitely get a vet to look him over. He is a bit underweight but a good vet should be able to figure out what's wrong. Most likely its his teeth or worms, which are all usually easy fixes. Good luck!
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