Just like most dog breeds, Labs do bark and for a variety of different reasons. Without plenty of physical stimulation and social interaction, Labs will bark more than normal, possibly to excess, due to their pent-up energy.

Why do yellow Labs bark so much?

Labradors especially are a very intelligent and social breed. If they aren't mentally stimulated and enjoy lots of social interaction, they quite quickly become bored. ... And when bored they will often try desperately hard to get some social interaction and they do this by barking for attention.

DO Labs bark when left alone?

Bred for generations to have a close relationship with his human family, there is no doubt that some Labradors become very distressed when left alone for long periods of time. They may bark and howl. They may chew up the fixtures and fittings in their home.