Bulldogs World

Does anyone have any experience with the above medication? Daughter has dog with severe allergies (and yes she's spent thousands on vets, dermatologists, etc) Has tried everything in the book. He is the worst case I've ever seen. Now 10, keeps it under control to some extent with Sulfa baths prescribed by dermatologist. Just want to know if anyone has personally had experience with this medication. Did research on Internet, was suggested by another Bulldogger. Does it have to be given IV?