I would never expect a dog to learn to leave cat food alone--unless you stand over the cat food all day to protect it!
Having had cats and dogs for 50 yrs-- cat food is always put where the dog cannot reach it--on a high shelf or table in an area the dog doesn't usually go. As in all training, prevention is 100% better than an attempt after the fact to change behavior.
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We don't see things as they are. We see things as we are. Anais Nin
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