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Robin asks:

I'm wondering if you could tell me why-- when I'm walking Yogi through some grass-- that he smells something and the next thing I know, he's stuck his head on the ground and starts to roll his body over the area he was smelling. On two occasions, he coated himself in another dog's poop. I've been asking vets and laypersons to explain this behavior but no one seem to know. Thank you so much for listening.