This is especially doable with dog food, as dogs rely more on smell than taste...

This is especially doable with dog food, as dogs rely more on smell than taste in making choices about what to eat and how vigorously. {Pat Moeller estimates that for dogs, the ratio for how much aroma matters to how much taste matters is 70/30. For cats, the ratio is more like 50/50.} The takeaway lesson is that if the palatant smells appealing, the dog will dive in with instant and obvious zeal, and the owner will assume the food is a hit. In reality it may have only smelled like a hit. Interpreting animals' eating behaviors

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