If you lived closer to me I would offer to adopt him...GSD's are my dream, I have always wanted one and it's sad to hear of one who's life may be cut short due to a very treatable illness. Please, opt to put him into GSD rescue before putting him to sleep. There are plenty of people out there who love GSD's and have enough money to pay for regular meds, and are desperately searching for the perfect rescue. Perhaps your last gift of love to the dog is to put him in a home where he will be able to get the medical care he needs to live a long life. Maybe you would even foster him until the GSD rescue finds him a good home, that way you can meet the new owners?

Again...it's too bad I don't live closer to you. I would promise, with all of my heart, to give that dog the best life I could possibly give a dog.