This is the 13573rd most frequent Swedish word.
vakthund
Guard dog.
In this sentence, 'vakthund' is used as a noun referring to a dog trained to guard premises.
Vakthunden skyddar huset från inkräktare.
The guard dog protects the house from intruders.
Here, 'vakthund' is used in a comparative context to indicate preference for physical security provided by a dog over technological means.
Han föredrar en vakthund över ett larmsystem.
He prefers a guard dog over an alarm system.
In this instance, 'vakthund' highlights the responsibilities involved in owning a dog specifically kept for security purposes.