Pony breeds are more prone to insulin resistance and equine metabolic syndrome. Signs of which including fatty deposits (cresty neck, fat pads at withers and tail head), history of laminitis, drinking and urinating more than normal, possibly muscle loss along the topline depending on the severity of the condition, poor performance, repeat or chronic infections, etc
So being a welch cob with a history of laminitis and a cresty neck, the possibility of him having insulin resistance is pretty good. You would be well-advised to have him tested and then make the necessary dietary and exercise changes. A simple screening test can be performed by keeping him off any food for 12 hours and then drawing a single blood sample to send off for a resting serum insulin. This test is not infallible, but it is a good way to start testing.
Licensed Veterinary Technician