If you say he washed the dog's kennel, I understand that you are talking about a specific dog and the kennel belongs to it. If you say he washed the dog kennel I understand that a dog kennel was washed by him. It can be any dog kennel.
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Anonymous
he went to the store and bought a dog kennel
Is 'dog' redundant?kennel
• noun 1 a small shelter for a dog