Thank you for your question. I am sorry to hear your 6 month old German Shepherd has developed blisters around her anus. Without looking and examining your little girl, it is difficult to say what might be going on. If you haven’t already I would take her along to your vet for them to have a look at her. German Shepherds are a breed that can suffer from a condition called ‘Anal Furunculosis’ (also known as a peri-anal fistula). Your vet will able to discuss this with you if it looks like possible diagnosis and advise what can be done from there.