What is your problemo?? If it is something bad you need to join a group.
If you want me to help you, you need to tell me the problem so I can help you.
Gog:}

 It seems to me that your dog is being exposed to some chemicals or allergens. Because it become infected again after the use of medicines. Note his feeding habits and watch his movements where he goes around during day time. You can also change Vit to get second opinion.

 There is something called creptoe it is found in bird poo and just because you think your dog has not been in it it might have been passed by run off water the only way for them to be able to tell is to send blood work off my cat has it and he is a in door cat they thought he had cancer until they sent the blood work off and that's how we found out what it was so that is one thing you might want to look into just ask your vet to run a creptoe test on your pet the main thing is don't just take your vets word for it get a second app.

 Has your vet checked for Parvos? Stool sample test within 48 hrs. The treatment could be deadly, but may also cure. My prayer is with you. Let us all know in your SHOUTBOX.