Instead of wasting time and money on supplements, over the counter meds and creams that should never be used unless a veterinarian that has examined the dog recommends, by the way, many of these supplements, ointments, over the counter medications (not intended for veterinary use unless prescribed as off label by a veterinarian) and homeopathic remedies are not only ineffective but they also are not benign and can have side effects and interaction with other meds.
I would take thee dog to the vet and get the condition diagnosed, that is the first step to treatment, an accurate diagnosis. See what your vet recommends, I’m am sure he has seen this condition many times before.
Do not change his food, unless the examining vet recommends, he may suggest a prescription/elimination diet for now, at least till the dog is stable.
Good luck
This is not veterinary advice; consult your veterinarian.
