This sounds unbelievable... but my dogs rarely do anything gross. I've never even witnessed either of them really sniffing at poop. AND THANK GOD!
When I was at the dog park once, I watched a Lab swallow a huge, fresh pile of poop a few feet away from me, and the next instant was jumping on my lap licking my face and hands, and clothes, and then trying to eat the treats that were in my pocket. EWWW! I screamed. His owners looked at me like I was a total douche.
Where we go to Flyball practice, during the spring, there are hoardes of Canadian geese. Once, Gonzo and Fozzie were both off-leash, playing after class, and both of them reached a section of the field and started frantically rolling on the ground. I ran over, and they had apparently found goose crap heaven, and were both covered in it. D; That's pretty much the grossest experience yet.