generally 2 reasons, 1. when a dog does not like the food they will often try to push it away or even toss the dish to get the food out of it. 2. Instinctively, dogs bury their food when not hungry. They will dig a hole and use their snout to cover up the food. As the dog cannot dig through the floor, it will mimic covering it.
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No I am not a Miniature Doberman, I was around 200 years before Karl Frederich Louis Doberman created the Dobie, and as for my friends the Manx cats, yes they are better at playing fetch than I am, I am a Miniature Pinscher.
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Weird eating habit 
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