Like this rock.
More often than not, after a lot of sniffing, he'll pee on the thing he's sniffing. Like this rock. And I know that the other neighborhood dee-oh-gee's are also peeing on this rock. Nevertheless, I always wonder about the intent way he has about sniffing this rock. Is there really any new information to be gleaned? Or is he gathering the same information constantly? Is it like Sherlock Holmes, stuck on an endless loop of visiting the same crime scene?
Anyhow, for some reason, it often reminds me of this brief bit from the pilot episode of Cheers:
"I smell something!"
"That's you, dude."
"Huh." [continues sniffing]