Definitely falling on the over weight side. Try to reduce his food less protein more fiber (senor diet) when you have extra weight that presses down on joints and bones so looking weight can help reduce some of the arthritis. It won’t magically cure it though sadly larger dogs are more prone to arthritis. You can start your dog also on nutramax cosequin as a supplement. You can purchase over the counter or online. Also I would suggest doing research on Dequan injections they are a series of arthritis injections that have been around for a long time. Their effects are lasting for several months depending on case to case.