Differentiate the inheritance relationsip v.s. the attribute of class?

How do you differentiate the inheritance relationsip v.s. the attribute of class??
Can any one give an example to support your arguments??
<!---Thank You soooo Much-->

It is a "has a" versus an "is a" relationship.
If a dog is an animal, then Dog should inherit from Animal (the "is a" relationship).
If a Dog has a DogHouse, then DogHouse should be an attribute of the Dog class ("has a" relationship)

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