Which of the following is more of a probable disadvantage in the use of sentry dogs?

Which of the following is more of a probable disadvantage in the use of sentry dogs?
A . A dog is more effective than a human during inclement weather.
B . A dog has a keen sense of smell.
C . A dog provides a strong psychological deterrent.
D . The type of dog best suited for security work is naturally dangerous.
E . A dog can detect and apprehend intruders.

Answer: D

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