For this reason, they actually make very poor guard dogs, although the will bark at people passing by on the street if they are in the yard or a kennel. (easyretrievertraining.com)
While many dogs are naturally protective of their families, there are some breeds that excel in this role better than others, and there are definitively breeds that make poor guard dogs and wouldn't mind at all if a stranger would trespass your property. (notinthedoghouse.com)
Retrievers are gentle, trusting and affectionate, so often make very poor guard dogs. (vetbabble.com)