There's seasonal shedding that occurs when the climate changes. If your dog has been shedding for more time than that, you can add supplements to his diet that contain omega 3 and Omega 6 fatty acids, which are very good for the fur and skin. Yafa gold is a very good supplement. If you want home remedies, I'd suggest a half to one teaspoons of ghee everyday with his food. I also recommend you deworm him if he's past his date.

I think seasonal shedding. dog seeds 3 or 4 times in his life . But if too much like skin visible then take to vet .

Or you can use salmon oil for better coat and hair