Join Date: Jul 2013
Location: Western Australia
Yes he is too thin. It's not helped by the fact he has a big belly, which is potentially worms (especially taking into account the rougher coat) and that he seems to have lost a lot of his top line. As JC said, teeth can also be an issue, not because he can't eat, but without proper chewing he can't break down his feed well enough to get the nutrition from it
What do you have available to feed him? I'd suggest that your grass and any local hay is pretty low quality, so you will need to find a way to add calories, protein and vitamins/minerals.
I'd also worm him ASAP , and repeat in six weeks or get a fecal egg count done. Getting his teeth done sounds like it could be very difficult if there is no vet on the island, but ask around and see what other horse owners in your area do.