C.S.
We had a large amount of flies due to a neighbor. Since we couldn't get rid of the neighbor, I went on line and ordered fly traps (hope that is not what you meant by jug). Anyway, they greatly reduced the fly problem. You can feed the dog garlic to keep the flies away from the dog.
http://www.doversaddlery.com/product.asp?pn=X1-2309&i...