Rufus decided to ignore me today while off leash at the park, and went down to the creek and rolled in something. He came out of the woods with a slimy spot on his butt by his tail and on his right shoulder. I have never smelled anything SO BAD in my LIFE. It's a horrible smell I cannot even begin to explain. At home I washed him with an entire bottle of shampoo and sprayed him with some deodorizer but he still REEKS. How do I get the smell out??