Lookouts, sentries, and guard-duty

[Scythe13]

Agreed, dogs would be brilliant. But not necessarily subtle, nor capable of relaying infomation.

Putting a guard dog with a trainer would make sense.

One thing though, a dog is usually a close up warning. A person can use binoculars and the alike, so their increased effective range is greater than that of a dog.

Just playing devil's advocate.