Dry and molted dog testicular skin is usually caused by orchitis caused by bacterial infection. You need to take your dog to the pet hospital for examination to confirm the cause and treat it promptly to avoid aggravation of the condition. You cannot force the skin to be ripped off. You must wait for the skin to heal itself. Come off, otherwise it will easily hurt the dog's testicles and cause inflammation.
Tips:
Pay attention to the hygiene of your dog’s reproductive organs, and wash them carefully when bathing to avoid the growth of bacteria.