Ask a "How-" question.
How big / tall is the dog?
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How heavy is the person / man / woman?
Ask a "How-" question.
How heavy is the watermelon?
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How long is the dog?
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How long is her hair?
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How wide is his mouth?
How big is his mouth?
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How high is the mountain / man?
Ask a "How-" question.
How tall is the giraffe?
Ask a "How-" question.
How high is the balloon?
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How long is the banana?
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How long does it take?
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How wide/long are the horns?